The problem has been over the last 20+ years at Ohio, LHunt and TOS were not the real deal and were only good at having enough sporadic success to keep their jobs. That has really been the modern era of men's basketball and us fans were stuck with mediocre coaches all this time. Groce looks to be something different, at least better than TOS and LHunt he's coached in more post season games than either of them in only 3 seasons. He's getting this program loaded in talent and if he is successful enough to take off to the Big Ten or Big East someday the program will be better for it.
This isn't quite accurate if you're looking for metrics for comparison's sake. Groce will coach his fourth postseason Division I game tonight at ETSU. Hunter has already coached four (three for Ohio, one for Western Carolina). O'Shea has coached three (all for Ohio).
Notably, Hunter cranked out seasons of 16-12, 18-10, 17-10, 18-10, 20-13 and 19-11 that did not lead to postseason appearances. Back then, you either made the NCAA or the NIT or you stayed home. There was no such thing as the More Is Better Mini-Me Basketball Tournament. If this year's team got into one with an 18-15 record, then several of those Hunter teams would have been shoo-ins. It's kind of like printing more money and saying you're rich.
Likewise, TOS had teams that went 19-11 and 19-13 and stayed home.
In terms of some signature wins, don't forget that Hunter in his final season beat West Virginia and Arizona State. Earlier he'd beaten Syracuse, UConn and Virginia. TOS beat Cincinnati, Virginia and North Carolina and damn near beat Kentucky and Louisville. Groce has beaten Georgetown but otherwise has fared poorly against top-level competition.
None of which is to say that the future doesn't look bright with Groce, that last year's run wasn't magical and well done or that this year's team didn't show grit and determination to turn what looked like a lost season into a fairly solid one. I also believe that Groce is likely to rack up more signature wins before he's done. My point is that there's really no objective reason thus far to exalt our current coach far and above the last two. Hopefully, that time will come.