They've been outperforming their mean for 18 months, this is how they should be based on all the stats, they simply cannot continue to be as lucky as they have been in previous seasons, it was unsustainable. This is still a team that won a CL and a PL however so they're not all of a sudden Fulham because they're not unbeatable any more.
Also, this bollocks about CB's needs to feck off. Midfielders can play CB, it's not that difficult for them, that's why Barcelona, Spain, and City have been doing it for years. Feck, even United have done it in the past with Carrick and Fletcher in there. You know why? Because the shitter you are on a technical level, the further back you go. You hear all the time about defenders that started out as strikers at youth level but got pushed further and further back once they reached a level where people were better than them. David May was a striker at school...
If being a defender is so hard then why do you never hear about people not being good enough to play defence so end up being a centre forward or centre mid instead?