I couldn't think of the rest of the players names but D Warren is actually in the NFL. Doesn't matter where or if they were drafted, he's good enough to play in the NFL. It goes back to personnel, you have to recruit guys that fit the philosophy and Rich Rod wasn't afforded the time to turnover that roster (his own fault b/c of his own antics). In his third year they looked promising and looked to be slowly turning the corner but b/c he was drawing heat from boosters and alumni he was cut short. That's not indicative of his ability to coach on either side of the ball. That's politics. And now he is less of a draw (prestige went from A to around B-). NFL talent doesn't automatically equal wins.
But let's take an even deeper look at Warren since you downplayed him. He was a top recruit in 2007 and looked promising in his Freshman year under Carr (same year Carr was fired). So let's say he came in rated a 82 ovr and in the offseason went up to an 86. So Rich Rod comes in his first year at Michigan with an A- prestige rating. Due to personnel issues they went 3-9 his first year. They couldn't run the offense he wanted b/c they lacked a Dual-Threat QB and the defensive personnel wasn't to his liking. That was Warren's Sophomore year and individually he did okay but the whole defense looked bad b/c of the change in scheme. B/c of a bad year he only progresses 4 or 5 pts in the offseason to an 91 ovr in his final offseason and Rich Rod's prestige drops to B (due to the horrific first year lol).
Season 3 (junior year) comes along for Warren is an 91 to open the season. Rich Rod now has had a FULL recruiting year to get in the personnel he needed (Denard Robinson and Tate Forcier) and they look way better BUT because it's a group of young players, especially with an freshman QB (freshmen QB's had low awareness resulting in sporadic play), they struggle to go .500 (they were 5-7). Now the hot seat has become hotter and Warren decides he's not sticking around for next year. Warren leaves as a 92 or 93 and goes undrafted but still makes an NFL team. He progressed 10 or 11 pts in his career. Warren still progressed but only by 10 as opposed to maybe 15 pts or higher b/c his coach constantly got worst while he was there. Rich Rod going down after year 1 affected Warren's progression into his junior year. He's in the draft, goes undrafted but winds up on an NFL roster.
YEAR 1: 82-86 (Fr to Soph) under Carr (B+)
YEAR 2: 86-91 (Soph-Jr) under Rod (who had a terrible year, went from A to an B)
YEAR 3: 91 (Jr) leaves for NFL (no offseason)
Is that not the case in real life also? Rich Rod came in as an A coach, had a horrible year b/c his scheme was a terrible fit for the personnel that was left to him. He drops in prestige, can't recruit as well or progress his players as well as a result. He goes from a year 1 A, to year 2 B, to year 3 C+ and gets fired.
Also, Jonas Mouton LB from Michigan was drafted 61 overall this year. Brandon Graham was drafted in the first round a year before that and Stevie Brown (Safety) was drafted in that same year. All the under Rich Rod. I think you're mistakingly over looking the fact that Rich Rod was there for 3 YEARS...not 4, not 5, but 3. Rich Rod's situation is VERY unique in that Carr left a mess, Rod had a scheme that didn't fit and because the scheme worked so terribly the first year for him it was an uphill battle that he couldn't win. He lost alot of appeal after that first year. Not to mentions the recruiting violations and alumni problems he had.