I won't be making up my mind about 21 year old players based on the peak years of club legends.
What I will do is look at potential - what are his strengths, how could he improve.
I think Savinho has the potential to be top-drawer. If his mentality and fortune matches his football skill, we could be looking at a worldy, IMO. Time will tell who is right but I would love him to stay and fight for his place.
It will be interesting to witness how our wingers respond to Cherki as a creator, in the way that those former greats responded to KDB.