One of the best. Not the best.
I personally have Orton over TT.
But TT had flashes where he showed he could play in this league. Young, extremely athletic, with some deficits in the more cerebral parts of the game. He had a higher ceiling than a Fitz.
If Taylor could read a defense, run an offense, audible, he would've been the best QB the Bills had had in a long time. Those things we hoped were teachable. It turns out they weren't.