BJ just came off of shoulder surgery for a torn labrum in his right shoulder in January at the end of the season which nobody even knew was that bad. He probably played through some of the season with it which goes to his toughness. He seemed like a gametime decision much of his senior season but I guess you could make an argument he's not that injury prone as he was consistently around without doubt the other 3 seasons before his nagging shoulder injury. He didn't want to miss his senior season for his team (especially since our secondary was absolutely decimated at times this season). I cant really recall
I'm not sure I'd call him small at 6'-6'1 205. He can put on weight if needed, we just need them lighter and faster in the Big 12 to keep up with all the speed. I also imagine seeing him being put into a Nickelback type role or something versatile and not specifically a safety type role so I would take that into consideration when imagining your depth chart. I'm not sure how the fins run their defense but I bet they fell in love with seeing BJ play everywhere from up at the line blitzing, run supporting, pass rushing, all the way back to 2nd deepest safety.
If you are thinking this kid could be a great special teams player with that closing speed, you'd be absolutely right. BJ freshman year he came in and blocked 2 punts in back to back games and also had a special teams safety. Everyone knew he was special when he would come in and make plays all over the place on all the special teams. They took him off special teams since he became the starting safety the next 3 years. I think he will be an instant impact ST player for the fins if nothing else. However, I think he isn't a starting option as a returner. Pretty reliable and good but nothing spectacular as a returner. He'd excel on Kick, PR, and Punt teams.
Here's a fantastic highlight video of him. You cant help but notice his overall speed and how he closes like a missile. He's very decisive in the run game. Hopefully the link works, I can only find it through facebook.