I get what you're saying, but I don't agree with you.
You're viewing it from the wrong perspective. Yes, the 3-3-5 works better if you have better athletes (much like every single defense ever), and yes Illinois will get better athletes than UM did, but they won't be getting better athletes comparatively than what UM did.
UM is a better recruiting program than what, all of maybe 10 programs at the FCS level, and I'm being incredibly generous to the other 10 programs. I know you guys like to act like Gubner is a once in a lifetime lineman at the FCS level, and don't get me wrong, he was very good, but we've seen NFL DT's come out of the FCS in recent years! Plenty of other programs at the FCS level were recruiting and developing good to very good DT's, there's no reason that Gubner should have been the only one that UM got.
Anyways, I digress. UM was one of the best recruiting FCS programs in the nation. Now, while Illinois is going to get better athletes than what UM has been able to, they are not one of the best recruiting FBS programs in the nation. They're not even close to the best in their own conference. While the overall athlete may be better, Illinois is going to be recruiting at a worse level compared to their competition than UM did. We've seen what happens with the 3-3-5 when you get better players than nearly all your competition...it's what UM has been doing the entire tenure of Bobby 2.0.