Rick is a pretty good business man so if he does bring Larson to the 88 I have to believe he has to have some pretty concrete sponsorship lined up or has something under his sleeve. I don't really see any other reason to do it unless Larson himself has found something. I also can't see Rick bringing him there without Chevy's support. But like everything else it will eventually become clearer to all of us.
If Chevy was behind Larson's return then they would have stuck him in the 48 with Ally Bank as the sponsor. That didn't happen. It appears that some distance was needed as the ride went to Bowman.