While it is easy to see the difference that summer signing Declan Rice has made to Arsenal's midfield, if there has been any upgrade at all from the Gunners' change of goalkeeper this season then it is much less clear-cut.
It is four months since Arsenal signed David Raya on loan from Brentford and Mikel Arteta spoke about ripping up the rule book and rotating him with his existing number one Aaron Ramsdale.
That has not happened and, despite digging into the stats behind both keepers over the past five years and watching them as much as possible in recent weeks, I am still pretty flummoxed about why he brought in Raya and made him first choice.