You're overlooking the simple answer to what ails this team.
There is no functional depth in the back court. There is now, since RJ can't play for squat, no functional depth in the front court.
We are asking our starting 5 to play 35+ minutes for an entire season, and it's caught up to us.
I don't disagree at all that our lack of depth has become an issue with guys wearing down. However, lots of very good college teams have little depth. Our problem is that not only do we have no depth, but like you said it's not functional right now, making it so that our starters have to be pretty flawless.
When Scott, Larkin and Kadji aren't scoring, we're very limited. When TMJ and brown aren't hitting and Reggie isn't drawing double teams (or is throwing it away) teams can pack the paint against our penetration, and then were even more limited.
If we don't get more from Reggie and brown, or don't go on a shooting tear like earlier in the season, we're all gojng to be disappointed.