Really think you are overestimating who he could have been. RR was def talented - if you want to say Britt was more so then that's fine. Here is Britt's write up before the NFL draft - looks like the experts felt like he was certainly talented, but not all world or HOF potential according to what was written about him:
Britt decided three years in Piscataway was enough after a junior season that saw him become the conference's all-time leading receiver (3,043 yards). The third-team Associated Press All-American and first-team All-Big East pick helped the Knights win seven consecutive games to end the 2008 season, concluding with the Papajohns.com Bowl win in which he made six catches for 119 yards and the go-ahead score. Despite a lack of straight-line speed and a history of dropped passes, Britt's size and toughness put him among the top receiver prospects in this draft. Had an arm span of 34 inches and a hand span of 9 inches at the combine.