Actually, I didn't read the article, just the preview (that's where I got the key passes stat) before heading to uni yesterday, although I did get most of my stats from WS.
You point out that during last season Cole was Chelsea's "only line of defence on the left". Well, while we do use a more defensively sound strategy than Chelsea, throughout most of last season this was the case with Baines as well, as neither Drenthe nor Billy were particularly fond of tracking back. Pienaar's arrival did improve things as he's more of a hard-working player.
And I never, not once, said that Cole is bad defensively. I just pointed out the fact (because that's what it is) that Baines can deal with top-class wingers just as well as Cole - and he has in fact been doing so for years - while also adding greater offensive contribution and set-piece delivery to the team. Thus, as far as I'm concerned, the need to start Cole ahead of Baines for the tougher fixtures is no more than a myth, and at this moment in time the only reason Cole plays ahead of Baines is reputation.