That's really shit about Chambers.
I also think Arteta looks a lot less of a risk now that we've actually seen him manage Arsenal. I think he'll actually do quite well with them - you can see he's already done a lot in terms of imposing a style of play and the Arsenal midfield actually has played a few matches where the players look like they've been given defined roles and they don't look like headless chickens just running around anymore.
And them fading in the second half of matches is understandable, given what David Luiz and Sokratis said after the match yesterday - they admitted that currently the Arsenal players don't have the fitness to press with the intensity Arteta wants them playing with for 90 minutes. That's going to come with more time on the training ground and more matches where they play in his playstyle.
So for this season with Arsenal at this stage, yeah you hope you can finish as high as possible because that's what all football clubs try to do, but the important thing is that the new man gets his philosophy implemented and the players all reading off the same page.
If Arsenal can actually get Xhaka performing like he did before they signed him, because he was actually really good in Germany, they'll be very happy. And considering how it was looking with his Arsenal future not that long ago, that's seriously impressive.