If he's riding the Duc, that's very telling in the wake of Rossi's departure....
Who knows, he might have pushed (no pun intended) for the move, himself. Also, if I were running MotoGP, I'd be very concerned that one of the factory teams (Ducati) clearly seems to have a several-years-long major issue with the spec tire, when it doesn't delaminate, that resulted in (first Stoner and then) the GOAT tossing in the towel and accepting a return to Yamaha at a less-than-god-like status...
Rossi's departure from Ducati and return to Yamaha is something of an embarrassment for the entire MotoGP community (circus), imo.
Waiting for the drama to unfold...