Gooner friend of mine is a big fan of his. Loves his work rate, holding play and general unselfishness that means all the others can play off of him and look good. And, of course, he comes up with goals as well.
I suspect he is a really under rated player and they will actually miss him.
He has been pushed out by Iwobi and Lacazette already, neither of which have done much - and neither have Arsenal.
Auba coming in will mix it up some more, but I dont know if he brings others into play enough to improve them as a unit.