Do you think basketball begins and ends on the offensive end of the floor?
Gilbert was incredibly poor last night, and if as many people played and coached horrifically you want to single him out, fine. But he is light years ahead of where Gaffney is defensively. Light years. Bringing Gaffney is may make us marginally better on offense, but it's not going to make us a better team. Yet. Unless Gilbert plays like this every game (which to be fair he hasn't).
Same with Carlton compared to Whalley. Carlton made an awful, awful boneheaded defensive play to start the game, but the rest of it he played well in his 20 minutes. He defended. He blocked shots. He rebounded. Whalley gives you nothing but minutes to rest Carlton. He was totally, totally overwhelmed by very mediocre bigs on the defensive end.
If there is one thing I would fix after last night it wouldn't be the lineup (especially where all 9 guys who played were given plenty of opportunity to show they could do better than the other guys). I would make everyone watch not primarily how Cincy set picks and screens, but how the dribblers used them by actually dribbling closer to the man setting the pick or screen so that daylight opened up. If you want especially to blame the coaches for something, blame them for this. It can't be a point of emphasis to use your pick better because it's not that difficult.