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Suchomimus
This massive predator was found in 1998 in Niger by Paul Sereno, Allison Beck, Didier Dutheil, Boubacar Gado, Hans Larsson, Gabrielle Lyon, Jonathan Marcot, Oliver Walter Mischa Rauhut, Rudyard Sadleir, Christian Sidor, David Varricchio, Gregory Wilson and Jeffrey Wilson. The Suchomimus is believed to have been both Ichthyophagous (was able to subsist primarily on fish) and at times a Carnosaur (was able to subsist on red meat if no other food source). The Suchomimus type specimen discovered in Niger was originally estimated at being 11 meters and weighing 5 tons, though these estimates were later reduced to 9.5 meters and 2.5 tons because the type specimen was found to be a sub-adult. Later studies suggest that a full grown Suchomimus ranged in size and weight from 3-6 tons, stood 3-5 meters tall, and was 9-12 meters in length. The Suchomimus snout contained 122 conical teeth that differ from most other conical teeth because the Suchomimus teeth bent backwards slightly and contained serrations. It was a heavily built dinosaur with its body being covered with powerful muscles, these muscles made the Suchomimus bite very lethal because of the combined strength of its teeth and its gripping strength. The Suchomimus is believed to have been a bipedal dinosaur unlike the larger spinosaurus giving it the ability to use its massive claws to rake its prey thats trapped in its powerful jaws.
Megaraptor:
Megaraptor should never be used for comparisons or fights due to use not only knowing virtually nothing about it, but also due to not even knowing exactly what it even was in the first place. After all, its entire existence is simply based on a claw that thought to be the dewclaw of a giant dromaeosaur-like coelurosaur; hence the name “MEGA-raptor”.
These days, megaraptor is considered to be either a neovenatorid allosauroid or tyrannosauroid coelurosaur. More paleontologists agree that it was more likely the hand claw of a mysterious neovenatorid.
Due to the lack of evidence of its existence in general, megaraptor has no real estimates but it might have been anywhere from 20-30ft in length
Who would really win?
Abelisaurus would triumph due to being about the same size but likely more robust, overall advance and equipped with much more powerful jaws. The only advantage that megaraptor would have would be its large claws larger arms. The problem is that dinosaurs such as neovenatorid did not have dramatic arm ratios. Dinosaurs in general actually had pretty short arm ratios, except for dinosaurs such as therizinosaurus.
There is no doubt that quetzalcoatlus was large.
But regardless of the size, it is unlikely that quetzalcoatlus could ever take on a predatory theropod over 20-30ft in length. Pterosaurs in general were extremely lightly built, especially the massive ones such as hatzegopteryx and quetzalcoatlus itself. They would likely get badly injured quite easily in physical conflicts, meaning very unsuited for combat.
Plus, quetzalcoatlus had an extremely lightly built skull with an overly elongated toothless beak. Such jaws would not cause any real damage to 20-30ft theropods; more like harsh pinches.
What should be mentioned first and foremost is that we know almost nothing about Siats or torvosaurus.
Torvosaurus:
Your estimates for torvosaurus is incorrect. Torvosaurus being 36ft in length was recently debunked officially.
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0088905
It turns out that specimen was actually 33ft in length, not 36ft. Even Wikipedia acknowledges this change.
Though it must be emphasized that wiki's weight estimate is innaccurate and very unlikely. At that weight for that size on such a slenderly built theropod, torvosaurus was even more robust and heavier than its much broader 39ft cousin, acrocanthosaurus; which is utterly false. If anything, based on torvosaurus close, similarly built relative allosaurus, torvosaurus was likely ~2-3tons.
Siats meekerorum
As for Siats, your size estimate for it is misconstruing the difference on how large Siats really was and how large it might have possibly been through maturity.
I don't know where he is getting his numbers from, but every legitimate source I read on Siats meekerorum puts it at about ~30ft in length. Additional size estimates are primarily based on potential growth estimates of which are not even really conclusive.
https://news.ncsu.edu/2013/11/dinosaur-discovery/
http://naturalsciences.org/about-us/news/colossal-new-predatory-dino-terrorized-early-tyrannosaurs
http://www.fieldmuseum.org/science/blog/dino-discovery
Even the actual, full scientific papers for Siats meekerorum states it at around ~30ft, not 40ft in length:
http://www.nature.com/ncomms/2013/131122/ncomms3827/full/ncomms3827.html
Lindsay Zanno has explained this to prevent confusion.
Just watch at 8:42 on Dr. Lindsay Zanno's video:
https://www.youtube.com/watch?v=zDxM0AVC29Q
There is also no way we can truly say if Siats meekerorum could grow up to 38ft, if at all. I watched an interesting YouTube video by content creator ThePrehistoricMaster where someone actually made a very good point
Quote by YouTuber +calibersoul2012
"As for Siats growth estimates (which is obviously what you certainly must be referring to, I assume), it is potential considering that it might have been a sub-adult. However, we do not know if Siats could have reached its maximum estimate estimate of just under 39ft, a more realistic estimate of 34-36ft or grow a mere foot longer. You also have to strongly factor in that this is all considering if Siats would have grow in size at all. The sub-adults of certain species will not grow after that stage in terms of size, just in appearances and maturity. We just do not know enough about this dinosaur to make such claims."
Siats was ultimately around ~30ft in length, not 40ft.
Who would win?
Siats meekerorum would ultimately triumph regardless of the torvosaurus length advantage.
Elaboration to why Siats would triumph:
The reason is because torvosaurus was not significantly larger and was a primitive megalosaurid of which were just a subcategory of even more primitive and relatively gracile allosaurids.
Siats was a member of the neovenatoridae, which are more robust than allosaurids but not as much as carcharodontosaurids; somewhat like the bridge between allosauridae and carcharodontosauridae. Thus, it is with great reason to expect Siats to ultimately be overall stronger than torvosaurus.
Additionally, Siats was also likely overall more advance.
