I'm not comparing Morata with Pogba. But rather with Berardi. At 21 he CAN be a starter for us imo, just like Morata was ready at 22 and like Dybala is for that matter.
And non of them would accept big parts of the season on the bench. Especially if we play with 2 forwards only, 3 of them would constantly be sidelined.
It's a big problem, look at what happened with Morata at Real Madrid. It's tough to find a balance between talent and characters that will sit on the bench for at least 1/3 games. You can see why Berardi may turn that down.