I rewatched it a couple of days ago, but to be 100% sure, I rewatched it again. My opinion was that MVDP followed Pogi's attack, and then the descent started in which Pogacar took the lead. Eventually everyone comes back right before the descent is over, and Mohoric attacks. Since Philipsen is already back then, and there are only flat sections left, MVDP decided to ride for one of the best sprinters in the peloton which is also his teammate. I don't see in which part MVDP should've ridden for himself.