I think Les would recruit about 10 times better
Why though?
He would be one of 5 college football coaches with a national championship, with lots of close ties to coaches with elite recruits.
You think the coaches he made connections with when he was coaching at LSU, recruiting against Alabama, Auburn, Florida, Texas, Oklahoma, Georgia, etc. would steer players the same caliber to Kansas? He would, at least in the short term, have to change how he operated previously.