This. JBJ has notDoesn't play defense. It's not an exaggeration to say he was probably the worst defender in conference play last year
Blackmon hunted his shots and played a lot of one-on-one last year. He also gave up and disappeared when closely guarded. How did he do against Purdue last year? Blame Crean's offense a bit, I supppose. Scoring a bunch of points against teams like South West Weasel State is not a measure of a great shooting guard.
Maybe he will be a better player this year, but I doubt he would start at Purdue. Now healthy, I will bet Stephenson will shoot a better percentage than JBJ this year. He was every bit the shooter coming out of high school JBJ was. Also, Mathias, as a freshman, was shown to be a better playmaker than JBJ. Both Purdue players bring significantly more defensive pressure than JBJ showed last year.
JBJ is a sophmore, and will probably go through his "slump" this year. By no means am I saying he is a bad player. I just think he would struggle breaking into the 2015/2016 starting line up at Purdue. IMHO, he would be third off the bench at SG. Maybe forth if Davis plays at the 2-spot.