Cech, Bellerin, Kosielney, Ramsey, Xhata, Ozil, Sanchez, Oxlade Chamberlain, Cazorla, Giroud (?) and a fully fit Welbeck, Wilshire, Walcott... all these players would improve us in some form.
I feel we have a lot of players who could improve them but nowhere near the class in depth that they have.