I think an interesting candidate for the "Associate Head Coach/Mentor" position we all seem to agree Drew needs to help him launch his head coaching career is Doug Wojcik, Paxson's dad, who is currently on staff at Michigan State as Director of Recruiting.
Wojcik, 57, is currently under consideration to fill the MSU assistant coach position vacated by Dane Fife, who left for Indiana. But if Wojcik isn't hired by Izzo I think Drew and Watson should take a close look at him.
Here is Doug Wojcik's bio from Wiki:
https://en.m.wikipedia.org/wiki/Doug_WojcikTwo head coaching gigs at Tulsa and Charleston plus assistantships at bluebloods North Carolina, MSU and Gonzaga. Pretty impressive resume.
One BIG caveat not mentioned in the Wiki article though is that he was dismissed after two winning seasons at Charleston for being abusive to some players.
This was several years ago so hopefully he has mellowed or at least learned his lesson. It might not be a bad thing to have a "Bad Cop" on staff to play against Drew's "Good Cop" personna.
This is all speculation. I have no inside info and no particular personal preferences. I think Greg Lansing is an equally strong candidate, and I'm sure there are others who fit the bill too.