It's not surprising to see this happening early in the year if you think about it. We have 4 seniors in the starting lineup who are pretty competent on defense (Bothwell has lapses occasionally, but it's not due to ability). After that, we are working other players into the lineup and experiencing the growing pains that go with it. Look at it by class:
Freshmen - Pegues, Williams, Repass
Sophomores - Anderson, Hien, Foster
This list doesn't even include Lawrence, who you have to hope will be back at some point. Anyways, where I'm going is that our top 6 off the bench to this point are sophomores or younger, and haven't played a lot of basketball. Add in the fact that we scheduled up this year, and it's not surprising we're getting exposed this early in the year. HOWEVER, I think that's something that can pay big dividends for us later on, especially if we're consistent with continuing to get the younger guys quality PT. If we don't, next year could be a rough one with everything we lose.
Side note: I still think that Pugh brings something elite that can help us, would love to see him get a shot at some point.