Surely you have coaching stuff for that? Or do we need to sign a bunch of older specialists to ensure Diallo's steady development in all areas? Quaresma can help him with the outside of the boot control, for example.
Well I think he is progressing with coaching etc but it lacks a bit of finesse that can arise from actually learning whilst directly competing from a player more in their prime and refined in their position compared to learning for Max Aaron's or Lamptey for example.
It's not something that's really directed to Wan Bissaka or particularly new - how many players within a squad have United had that are either in their prime or directly an experienced player post SAF?
Off the top of my head we bought and had teams built around Rashford, Shaw, Martial, Januzaj, Depay, lingard, Lindelof, Bailly, players like Valencia and Young who were semi-fullbacks, pogba etc - all players under 25 when we bought them or players that are not particularly special at their role (for example Fellaini as our CM).
*Mourinho focused too much on this and added players in their prime or experience that he prefers managing but didnt care as much about the youngsters or the rest (Sanchez, Mkhitaryan, Zlatan, wanting perisic, Matic whilst pushing away Rashford, Martial, Shaw even Pogba)
I only bring this up because you look at Liverpool's title winning team or City's- their age of their first 11 was high or if not more equally spread to involve players in their prime, relatively experienced or approaching it (Salah, Mane, Firmino, Henderson, Winaldjum, Van Dijk, Allison, Matip, Lovren etc).
I feel that Ole is balancing the squad now with experienced players like Cavani, Telles, Mata, Ighalo & Matic, players in their prime like Bruno, Fred, Pogba, Maguire, Lindelof, etc to make sure we are not a team solely made of a heart full of youngsters that are easy to be pushed over.
That's why Ole will probably target Trippier, because he is an experienced player in his position, capable of being a very good player for us almost instantly whilst also having the ability to play directly differently to Wan Bissaka's style (which can help his progress). Having that player that plays in a different way to the one you already have whilst both being useful is a great piece of business.