You could put Mbappe in this United team and he'd look like Oxlade-Chamberlain. Sancho is more talented than Foden, but you won't see it in this team unless something changes quite radically.
Guardiola is far too obsessed with having a left sided CB in the pair. It's bad enough when he weakens the team by putting Laporte in ahead of Stones, but Ake? That's just lunacy.
If he could put the running in off the ball, Grealish would probably work better at an #8 for City than a wide forward. He just doesn't have the killer instinct to be an attacker.
They'll go on runs of looking like a really good team but they don't have the mentality to keep it going for a season. They'll go off the rails once or twice when things get tough.