New Species: Tyrannosaurus X

Everybody knows about Tyrannosaurus Rex: A giant theropod that grew up to 43 feet long and weighed up to 9 tons. Though it was once speculated that Tarbosaurus bataar could be a species of Tyrannosaurus, it is now widely accepted that there is only one species of Tyrannosaurus: Rex. But as soon as that controversy ended, it appears another may be beginning. Tyrannosaurus "X" is a possible new species. It differs from normal Tyrannosaurus by having smaller and more tightly packed teeth with an extra incisor, a more slender and lightly built skeleton with longer legs and a longer tail. It also had a shorter more juvenile-shaped skull with a smaller nasal opening. In other words it looks like a giant Nanotyrannus. All of the Nanotyrannus specimens found so far have been juveniles and subadults, even the 30 foot Nano fighting the ceratopsian wasn't yet fully grown as displayed by its partially unfused skull bones. It was also theorized that it may be a male Tyrannosaurus, but such sexual dimorphism is unseen in any of its relatives and the ratio of "X" specimens to Rex specimens would likely be way more even. Whatever the case, the specimens appear to be longer than Tyrannosaurus Rex on average by a couple feet but are much lighter. Do you think its a new species? A Nanotyrannus? A Tyrannosaurus Rex?