Qwiss I guess I was thinking more that it's super unlikely you're gonna get someone as good as Saka to cover for him - and even if you could, how much would he cost? So you have to accept you're gonna sign someone who's not as good, but can do a job - and Reiss Nelson has shown, admittedly in patches - that he can do a job. But yeah, I take your point and probably wouldn't want us to sign him, but that's not the position we're in.
I don't think he should stay, for the reasons I outlined above, but I can see why the club would want to keep him.
EDIT: Although, I do think Edu needs to have a frank conversation with Arteta and ask how much he is actually going to use him, otherwise we will end up in an Ainsley Maitland-Niles situation.