The only notable player from URI who has played in the NFL was Steve Furness. He has a nice career with the Steelers in the 70s.
The only SB player who had any kind of career was Will Tye, who was a starting and/or second TE with the Giants for a couple of years.
In all fairness, Coxson should have been drafted. He had a shot with Green Bay because he had very good speed and decent size but suffered a severe concussion and retired.