Manchester was a DIII school. If that defines a great coach, all I can say is WOW.
Let's look at success, by your standards. He finished 4th, 2nd, 3rd and 2nd in Missouri Valley (at SW Missouri State) with 1 NIT, 1 NCAA (Sweet 16 that he parlayed into the Iowa job) and 2 non appearances sandwiched in between. At Iowa 7th, 6th, 8th, 8th, 4th, 7th, 2nd 4th with 3 NIT, 3 NCAA appearances and two non appearances. At NM he finishe 3rd, 1st, 1st, 5th, 1st and 1st with 3 NIT and 3 NCAA appearances. Now, you might say that NW is impressive, well, with 4 conference championships in 6 years and one of those being an NIT reward, that may tell you all you need to know about the conference.
All I can say is that with the results he had in season and post season, if he does that at UCLA, the job will be open again in short order. Certainly not impressive at all. Great? Really? Are you sticking with that one? WOW.