Read an article a while back that Chelsea's coach contracts have a rolling 12 month get out clause, so the 6.5 isn't a real number. No serious coach would likely sign up to that, but probably one like Rosenior better fits their model anyway? They are pretty much just a pyramid scheme based on player trading these days, and may also be a shop window for up and coming coaches too, where the main metrics are talent development over footballing glory. Whether Rosenior works out or not probably doesn't matter much to them, although regardless it has to be a good thing for a black coach to get a gig at a PL team.