FWIW, Hooper, I get your point. Benny is a senior and he's paid his dues so to speak and that in and of itself is not worth nothing. He deserves at least a little respect in this regard. Not to mention he and Shavon have really good chemistry on the court - they've been together now at NU for all 4 years - and just tossing Benny aside might not go over well with Shavon either.
OTOH, it is obvious that Glynn is a major upgrade at the PG spot and he will not be denied the opportunity to start either. You can't just let the obviously better talent sit and "wait his turn" as that isn't fair to him either. Plus, you don't want to have another Tarin Smith situation.
So, IMO, you need to proceed with these two with plenty of caution. You can't rush Glynn, and don't just toss Benny aside. It needs to be made clear that they are in contention for that starting role (and probably will be all season) and they need to both be given ample opportunity to prove they deserve to be the man. I have faith it will all work itself out, hopefully without effecting the team's chemistry.