A few things.
Koeman seems to be trying things. When we played three at the back we were extremely solid al though not offering much in attack, we did score tho but looked quite lop sided and Jags often left with decent ball. If we had say, Stones in that position we would of killed them first half.
4 at the back and we were very open and stoke got into very good positions easily.
If Barkley wants to become a very good player he should stay and learn from Rooney. He controlled the game for us 2nd half with sublime touches, amazing passes and general control of time and pace. We haven't had someone here for years who could do that and his class will show against the lesser teams. He might not be so influential against the top teams but what a performance.
Gueye was brilliant as well. What an engine and only first game of the season. Devilishly handsome too. And Muslim. The perfect package.