I can't say, I haven't seen his speed. In the pros, there is a big difference between a 4.56 and a 4.64. If hes on the low end of that, with his height, he will be a rich man.
The article is excellent. He can catch (unlike hill) but he can drop too, so he's not a Wes Welker (or whoever you think owes his career to not dropping passes. Clay Matthews? I don't profess to follow the pros that well)
He does not have insane passion for football. He does not block that well considering the size advantage he has. Some of the most fun I had watching Tech was watching Thomas absolutely molest defensive backs. Top dbs, pushing them around like they were middle schoolers. Amazing. Waller should have been doing that this year. If he had, he would be a first day pick. The fact that he hasn't makes him a reach that early assuming 4.6 speed.
He is huge. Huge. There is a big difference between 6-6.75 and 6-3. Even 6-5. Hes being chosen based on potential, obviously, so 5-20 pounds of muscle is pretty irrelevant. If they think he needs the weight, the know they can put that little but of weight on the guy. Hes a good size for special teams now. He can play the slot at the weight or TE when its obvious he will be going out for the pass.
It comes down to speed. Every .01 second means a bunch of spots. Get into the 4.5 range, and hes rich. Uncork a high 4.6, and hes gonna be a FA, IMHO.