I had a conversation with one of my cousins about this:
Me "Did you hear about Portnoy leaving Dream Theater."
Cousin "Oh yeah."
Me "What's interesting is that right after they auditioned drummers - Mike Mangini quit teaching all of his Berklee classes for reasons he can't disclose."
Cousin "Hmmm... Good."
Me "Why specifically is that good?"
Cousin "Dream Theater started at Berklee, and now they're bringing in another Berklee guy."
My cousin went there, so it's natural he'd go that direction, but he brings up an important point. Without consciously saying "Hey, let's get another guy who went to Berklee," maybe there's a shared musical sense that comes from being involved with that school.