Agreed, there are alot of players in our squad with potential, I can see him improving alot of them.
Jota was a very good player at Wolves, he fitted Klopps system, which is why they bought him.
I could reverse this and say, look at Klopp with Benteke, Sakho, Clyne. Yes, these managers can improve players but sometimes they just aren't able to.
RR hasn't got much time with this squad, his aim would be more improving the team and the squad rather than focus too much on individuals. It is also up to the individual to improve and find ways of improving.