Proven in what respect? Silverware? As a player (i.e command of dressing room)? As an Evertonian? Or simply in the Premier League?
Not that I think we could get Mourinho, but it shows that prior experience isn’t everything. Henry was one of the best players i’ve ever seen and his time at Monaco has been a disaster. Arteta wouldn’t be right for me (I don’t think an affinity with Everton is at all important - I actually think it would work against us) and there’s few managers with more PL experience than Big Sam.
It goes to show that whichever route you go down, there is no guarentee. For me, the single most important thing: Culture fit. Personality. Ambition. Does all that align with the club?
As nobody knows the lengths of the club’s genuine ambitions (which is a major frustration for us all), it’s impossible to even suggest possible replacements. Either way, I think most blues are rapidly reaching the conclusion that Marco was the wrong appointment.