Berian just wants to run.
He comes off as a pawn in New Balance's play to try and get a hold of the Big Bear TC (Basically just to double down on Martinez and Berian) and Hawi is there to broker the deal and surely benefit.
Boris ran his PR in Nike shoes, after training in Nike shoes, and his reasoning for wanting to leave?: The shoes hurt my feet.
If he was training independently, and had another agent, he would happily be preparing for Rio in Nike shoes.