Chelsea have their back four to thank for the point they earned at the Etihad yesterday. Chelsea drew 1-1 with Manchester City and the likes of Axel Disasi and Levi Colwill were excellent. Liverpool legend Steve Nicol, speaking on ESPN FC, has now urged Mauricio Pochettino not to break up that central defensive partnership. Disasi and Thiago Silva have been Pochettino’s main centre-back pairing this season, but with the latter injured, Colwill started in central defence and really impressed there. He made 10 clearances yesterday, with only Disasi managing more after recording 16 (WhoScored). S…