>>5024927Tyrannosaurs did not evolve from a small feathered ancestor. No dinosaur did. The only ones that even have plausible deniability are the coelurosaurs, which despite online idiocy does not include every fucking theropod you've ever heard of. It's mostly a cluster of random animals like Alvarezsaurs, Ornithomimosaurs, Oviraptorosaurs, Therizinosaurs, Dromaeosaurs and a token few other critters. Tyrannosaurs are not on that list.
To this day the only dinosaurs outside of china or mongolia with feathers (supposedly) are Archaeopteryx and Ornithomimus and there's even some funny shit going on with Ornithomimus.