There isn't a rule in football that fullbacks need to provide width. In fact, Man City use their attackers and midfielders to provide width and the fullbacks help out in midfield. City when they are chasing the game push their fullbacks up; but it leaves them more vulnerable to the counter attack. More often than not, it is one of Sane, Silva, Silva and KdB putting crosses in, not the fullbacks.
We have one good crosser in the team, and he's a bloody right winger at left back
so he has to cut inside all the time which makes him predictable. IMO, our team is ready made for a natural right footed winger to play on our right wing (Willian would have been great for that
).