No. His offensive position does not change his defense. More times than not he is going to be assigned the opponents weakest link in the backcourt, which would be the case regardless where he was playing on offense.
The only way our “team defense” would improve with JBo playing the 2 is if Cmac is a better defender than Dailey, Weiskamp, and Moss, which I do not believe to be true.
Our offense is in good shape, our defense is not, which I why I never understand all the interest in JBo playing the 2 spot.