He played the game, didn't cause trouble, wasn't a diva, etc.

When he was asked to play on special teams, he did it without complaint. When asked to be a brute blocker for Tony Jones, he'd do it, no complaints.

His first two years in the NFL were productive, that he was a very solid WR2 / WR3 who looked like he could easily become a WR1, but he never overcame the shortcomings.

Physically speaking, he was a freak of nature, being tall, 230 lbs, and running a 4.42 in the 40, but there were some fundamentals that stuck out like a sore thumb once he got to the pros.

I *suspect* that with all of the success he had in college, mostly through natural talent, he didn't like being corrected by his WR coaches in the NFL.