I agree with you on those points about the step up in quality of players. My concern is when Emery sets the team up like he did at anfield. No width so whoever is playing on the flanks (Bellerin, Tierney, Kola or AMN) will get exposed to 2 players coming at them and interchanging.It's unbelievable we don't set players down in corners, especially at end of half. This was exactly the same with Wenger's last years.
But in the goal Kola ran in very stupidly and left his flank open. Tierney is smarter than that surely. Tierney is better defensively than Kola. And Bellerin better than AMN.
That spells disaster In my book because our Central defenders are not dominant or quick enough to plug the inevitable gaps that will open up. Though im willing to give him the benefit of a few more months to see how the team improves when he has these players and others at his disposal.