I'm sure he has a pretty good idea of who accepts money and generally from which school, but I can't see why he would know anything concrete unless (1) he was involved in paying college players and got info from bidding wars or (2) players he represents have told them of money they accepted. Not really a good way for him to divulge any of that information.
I guess he could have some clients that have told them about money they turned down from Alabama, but if he's not breaking any rules and jeopardizing anybody's eligibility, you're talking about hearsay about stuff that happened over 3 years ago.