Why would Del Toro leave the team if he wins the Giro AND. Ayuso leaves (as you stated)?
Then he'll have an open path to number 2 in the pecking order (only battling Almeida) and depending on his progression and Pogacar's desires and the power balance between him and Vingegaard, Del Toro may have an open path for a free role in the Tour as early as next year.
If Ayuso wins the Giro, he'll want to be the leader in the Tour.
If Ayuso doesn't win the Giro and Del Toro does, his situation will be very complicated.
Ayuso isn't going to be anyone's domestique, and Del Toro would demand more leadership.
Ayuso's time in the UAE has no future, whether he wins the Giro or not.
If Del Toro wins the Giro, will he go to the 2026 Tour as Pogacar's domestique? Hindley has done that with Roglic, but before that, Hindley led a Tour and saw his level.
Perhaps Del Toro will last another year in the UAE, but it would be a complicated situation. We already saw that at Visma. Roglic and Vingegaard didn't spend much time together as leaders.