I don't think Julian is the problem but rather Foden's inconsistency.. we've waited years for him to become the true KDB successor, and he has a good game and then follows it up with a bad one.
Also he is a bit selfish and doesn't square it when he should.. where as Julian even though in a slump always goes for the high % play, passing to a team mate.
Maybe Pep sees the same and wants another winger to move Foden to central midfield alongside Rodri.. the Stones role to cover for when Stones is injured.
But even bigger problem is inconsistency in midfield. while everyone is saying we should have scored more with KDB.. I think the ability to kill off other teams's chances in midfield before they get to our back line is even more dire.
I think we might actually be active this winter transfer market!