Dino picks a different side before the Ring Battles. Xanxus approves.

The idea comes from Visconti, who has been the one stuck riding herd on his bastard daughter the majority of the time. (He's the only one strong enough to do so, and with hindsight, it had probably contributed to his Cloud suggesting this as a solution.) It makes a lot of sense; they needed the Cavallone to keep guarding their flank, and Xana was of an age with their remaining heir.