No, you're flat out wrong. Many, many, many athletes have been denied admission at Big Ten universities and gone on to play at other other schools in other conferences. My god, the list would be nearly endless. You're best to simply bail out of this discussion.
Jacob Thomas is not a football player, but a basketball player. He could not get into the U. He is currently with Monson at Long Beach. Calvin Godfrey was a guy Tubby also wanted. The U said no. Iowa State said yes. Vincent Hill was a highly-ranked football player that was denied admission at the U and was accepted at Temple.
That's not to mention the countless players that both the football coach and basketball coach at the U would have pursued, but didn't because they knew the U would not let them in.
Brewster actually had some success getting a few more borderline guys into school than Mason did, but still could certainly not get everyone he wanted in.
And, to be honest, we aren't in that bad of shape. Other Big Ten schools are more picky than we are. Most Big Ten schools get a set number of "freebies" - which is to say guys eligible by NCAA standards, but not by school standards. Those "freebies" are NOT unlimited. Michigan doesn't let any partial qualifiers in. Northwestern doesn't give but one or two. Minnesota a few more. But, if Kill wanted to recruit 20 guys that are below U standards but above baseline NCAA standards, no chance ever he would get all 20. Probably more like five. Oklahoma??? They probably would get 10 in. Tennessee??? They might get 15. Boise State? Almost all 20.
To say that any athlete eligible by the NCAA would be admitted to Michigan or Northwestern or Purdue or Wisconsin or Minnesota is just wrong. Many athletes have been turned down by those schools and ended up at other schools, playing as freshmen. Boise State has made a living off of getting guys like this into school. High-end FCS schools have feasted on this, too. Simple as that.