So I see it like this NAIA -> D3 -> D2 -> FCS -> FBS. Hence the Don Read from D2 Portland to FCS/1-AA Montana is only a 1 level move-up while MVD to Montana is a multiple level move up. ADDITIONALLY when Don Read came to Montana our team was terrible, it was not the continual national contender that it is in this time. FINALLY it's hard to compare the competitive nature of the college football era of the mid 80's to now, nearly 30 years later - two totally different platforms.
Look at Brian Kelly, one of the greatest recent D2 coaches, he went from GVSU to a dogcrap Central Michigan team, turned them around, then moved into a BCS-leauge team Cincy, and is now at Notre Dame.
Or Chip Kelly who was an accomplished lower division assistant I believe and worked his way up at a then super crappy UNH FCS team, then moving up to an assistant job at still emerging (at that time) Oregon in it's newer system - which he grew to what it is today.
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Oregon and Notre Dame would not reach back and pluck a successful D2/D3/lower coach for a head coaching job - that coach would have ranks to come up thorugh to PROVE they can coach at the next level. M
any other coaches that were successful at other levels have proven as they move up the chain they can't cut it - and it's not worth the gamble to hire a coach out that has no head coaching experience at the level the team currently plays at. Schools like Idaho State and UNC can take that gamble, hire a successful NAIA coach and if he works, great, if not - no biggie, more bad seasons ahead. Schools like Montana can't / won't do that.