What do fullbacks/wb's have to do with scoring? They're there to stretch the field and assist (like Dani has done innumerable times with Messi). Having a 433 with alba and alves would definitely help with parked busses (but would makes us even more vulnerable).
Alba is not a bad transfer by any means but I don't really think it is what we need right now. There's obviously a limited budged and priorities should be to make strong defensive buys.
You're right, they are supposed to stretch the field. But playing two of them, even in a 433, isn't practical. Both of them bombing forward is stupid, thats only two people defending and would force Sergi to stay back more....which is not his strong suite and keeps him from doing what he's actually good at doing. Two attacking wingers and 1 attacking fullback is enough, the other fullback should be ABLE TO ATTACK, but primarily defend to allow the attacking FB, like Dani, to attack more freely.
And Adriano is as good as Alba or better, and he's free because we already have him. Such a waste of 13 million which could be spent way more efficiently.