I'm not sure I get to 7 or 8 quality players. Maybe 6 if we're being generous but some of those come with serious questions about their ability to stay healthy which is something to factor in. At any rate he had a Napoli team with Higuain, Mertens, Insigne, Koulibaly, Hamsik, Jorginho, Callejon and others and had their worst season until Carlo Fraudtastico came in and crapped all over it to a larger extent. So that's not actually making me feel too good.
I have a hard time as seeing Benitez as a "serial winner" and even if that was true we just got done having an even better version of that being a complete failure who quit when it got tough. So sorry but I'm not filled with much optimism here.