That's right, Dybala's future at Roma is even more secure than at Chelsea and as you said he has always had a starting place under Mourinho's command. Actually, Dybala is still relatively new to joining Roma after being brought in since last season from Juventus, so he still feels he has a responsibility to complete his duties with the Roma wolves. Chelsea are not likely to push Dybala too hard and besides they are now filled with many young players and I think choosing Dybala who is almost 30 years old is certainly not the right choice.
If Dybala is still very suitable and comfortable at AS Roma, I don't think he needs to move to another team for next season either. Especially if the choice is Chelsea, which slumped last season, so obviously it will be very difficult for Dybala to return to develop there with the young players who have been brought to Chelsea. So it would be great if Dybala wanted to continue his career with AS Roma next season by continuing to work together so he could bring AS Roma to a better position than last season.
a player to improve in his career must also play and prove it
if he's only good on paper and on the bench, he doesn't have much of a future
Dybala made this choice exclusively for this reason, it's right for his career
The focus for Dybala should not be to change the clubs now, but rather to stay healthy and try to contribute to a team in which he has his place and is well accepted. Last season he was injured a lot and still got his chances from Mourinho and paid back and Mourinho accepts and likes him. But if Dybala were to go to Chelsea, an injury could literally mean the end more or less for that season as there is so much competition within the team and it is harder to come back. In a toP physical condition I think he has the potential to become a player of the season in Serie A, but health held him back quite often.