My principal concern with Benitez is that far from the new broom that Usmanov / Moshiri may think he is, he'll go out of his way to be accomodating and conciliatory and just go with the Everton flow on everything. A three year contract at home is his for the taking.
If he / they wanted to have a smidgeon of understanding on how to win support here, they could use Benitez' as the foil to remove these hangers-on, let alone attract more of them to the trough.
That cull first, and then the squad. Do that and sell it to the supporters, it would at least be an olive branch that there was a degree of seriousness at long last about turning the club around.
I don't see it working out like that.