Personally, the act of oversigning is not so much relevant as the result of it. When you have Vonleh, it is irrelevant if you oversign. This year, it is absolutely irrelevant as well. Bryant and OG are pretty much gone, and IMO Blackmon Jr. is a strong possibility. It is not really the integrity/loyalty, but the fact that we do not have the opportunity to sign some better recruits. When Groce had that opportunity, he was ready to do it.
We say that scholarships do not matter (I am in that group), but when others oversign, then we suddenly become sensitive. I think some of the sensitivity is motivated by the fact that they sign a good player, the competitive aspect.
As far as Crean, as I said, he is not saint, but some of the early "creaning" was more because of Sampson IMO and the mess he left behind (IU was left with almost no players because they intentionally and justifiably forced the Sampson players out). He will still oversign these days, but in some years (like this year), it is totally irrelevant IMO.
Other coaches? Is Bielein a saint when he forced players with very high contributions to his program (Bielfeldt, Albrecht) out? To some extent, I think that was worse IMO.