It seems clear to me that Pep wants 1 of the fullbacks to join the midfield in possession.
We have currently rotated between Lewis and Gvardiol doing it.
The other 3 defenders need to be warriors and stop counter attacks.
The only one who can usually stay fit are Dias, Akanji and Walker.
Stones and Ake are always injured.
I think personally, when we bolster the squad, we should buy 1 more of these "more attacking fullbacks" like Gvardiol to have 3 options for the attacker.
LB or RB doesnt really matter to me.
As well as a 2 more defensive ones like Akanji to replace Walker and one of Stones/Ake. We need 3 if both of these go.