Don't wanna question your brother in laws credentials but I remember how bowled over he was by Andre Villas Boas, for Juve.
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I'd say the closes thing to Roberto Carlos in terms of balance and movement, only not as good and as strong. To me, he's like the next best thing to Marcelo and Ric Rod, and will get even better with time. Reminds me a lot of the Vidal move in terms of how important he will end up being for us.