Stats would also suggest that Chelsea defense has allowed least amount of shots on target in PL.
Szczesny(did I spell it right?) is having a great season, Cech has been good but not outstanding, this season.
Yeah you did and he is except for some moments of madness.
Chelsea also have conceded less, but factors like that are more of effort of whole defence and not just CB's. He based his article purely on individual stats of all CB's where in almost every section Kos and BFG are ahead and that way managed to "prove" that our pairing is best.