This is simply not true. Wilson became a multiyear starter for the lions, and, IIRC, was one of leading tacklers among S's for a couple of those years. As a football player he was a solid pick. I always thought Wilson got tarred his rookie year when he was thrown into a game (Seattle, I think) and go fooled on a play action pass for a game winning TD. I thought this was hypocritical of Pats fans who watched HOFer Troy Palamalu get beat on Play action Passes by Brady and the Pats on a yearly basis. Yet somehow Pats fandom never forgave a young rookie one mistake.
IIRC wasn't BB's draft strategy to take a sure bet in round one and take shot in the 2nd. Sometimes you win with a Gronk and sometimes you lose with a Richardson. And when you take shots you are losing more than you win.
As for Mapu, my question isn't that they essentially let him go for nothing, is that why now. I was under the impression that he did a good job on ST's and was learning how to be a LB and would likely be better his 2nd year in the system. So why not do this in camp if he didn't improve. Why the rush?