@Porque
Fabricio looks more ready but doubt Xavi would see him as immediate starter either. That's why my point about signing Romeu AND a kid to groom at the same time.
Yes, Diaz would fit in a double pivot with FDJ but longterm I still think Xavi prefers a single DM and from the little I saw I think Zambrano would be better for that role. Would ofc need to see Zambrano in some actual games to get a better opinion on him though.
As for Diaz wouldn't surprise me if in our system he'd be better used in the FDJ than Busi role. But again could be wrong and just based on his performances for Uruguay U20 where midfielders had interchangable roles.
In ideal world we shouldn't have a dilemma between Diaz and Zambrano, we would sign both and then let time and their development decide where and how they fit (could add someone like Pau Prim in the mix too). Potentially both would find a role or we could keep one and sell other. Or as it's usual with these punts for the future they would be both gone in a few years but at least we would have better chances (in theory) at least one of them would stay.
But financially we're in a position where every million we can save is important so getting both is next to impossible. We're not Chelsea to hoard talents (although when situation improves we should start doing that as it's unlikely we'll be able to compete for big money signings anytime soon).
OTOH both Diaz and Zambrano should be available for less than what we were ready to pay for Arda Guler and if one/both wouldn't go straight into the first team we also wouldn't need to register them now.
@khaled_a_d Starting initially in Barca B is good for players's adaptation under less pressure and ofc getting regular minutes which they need at their age to develop. Could still train with the first team and get some playing time there. Worst thing we can do is keep a player on the bench for whole season like we did with Torre.
Loan ofc is also a good option but would need to find the right club and player agreeing to that in first place. Not everyone will like we've seen with Guler.