Sure you can go ahead and sign Bellerin for 40m and let him compete with Roberto, but if Roberto performs at a World Class level, why not buy a RB with WC potential who would cost far less?
This Almamy Touré seems to be the highest rated RB talent in Ligue 1 right now with reportedly good technical skills, passing range and defensively sound. Time is a problem, but if I got it while Monaco are playing, I'll definitely want to keep an eye on him.
I wouldn't mind Bellerin, but if Hector want to return then he need to do so by not signing a contract extension and pushing for a move. He left in the first place when the club wanted to keep him and there's no way in hell Barca should pay 40m+ for him if Roberto settles down at the position.
While I'm writing this, SPORT just published the first part of an exclusive interview with Mestre hinting towards a possible return of Bellerin lel