Well, hes only 20.
I wouldnt expect defenders to put it all together until 21-23? Most decent U21 players are usually forwards. I am very pleased with Dest so far. Wouldnt mind us planning with him as backup for Alba (+battling it out at RB with Roberto/Emerson) either.
So so good, dribbling wise. Might be on Alves's level already when it comes to that. If only he improves his link up play as time goes by like Alves did, plus becomes at least solid in defense, we'll have his position sorted for a decade!