What ever we do, we need to decide.
Chiellini is versatile and can adapt, but he is nit that young anymore.
Switching back and forth, dont favor him.
I think its wiser to keep him in the center now. As he grows older and loses stamina and speed, he will be less effective as a LB, esp in Conte's formation.
The right time to use him as a LB, was when cancer Molinaro was there. Chie was younger, clumsier and faster then.
All these years turned him into a better CB, his role in the NT is as well there, so we better keep him there.