When I was drafted out of Grambling, the Oilers played me at defensive back, and later used me to return kickoffs. That didn't last too long, however; soon, I was playing on offense. Houston sent me to Cincinnati a couple years later, but it was only after being traded to my final team that I reached my true potential. I played in the NFL until I was 39, and when I finally called it quits, I had caught more passes than anybody else.
Bill Walsh called me the most calculating receiver of all time - who am I?