probs gonna get shouted down for this, but seems a bit of a coincidence that he hasnt been at his best since Grealish showed up. Thats all i'm saying.
Plenty of players have been at their best since Grealish showed up. If Jack's not getting the credit for their success then I don't see why he should get the blame for whatever blip Phil might have.
Foden's ridiculously talented but still relatively young and inexperienced. He's going to have dips in form, he's going to have times where he doesn't consistently hit the heights we know he's capable of...learning to deal with that stuff and overcome it is what's going to build him up to the best he can be.
I don't think being friends with a teammate is going to divert him from his path to greatness unless it's a diversion he would have taken anyway.