A central defender is more important than a left back and although Cole is quality in that position Arsenal never really missed him last season.

Gallas is class and will improve Arsenal and he has another 5 good years in him. Plus Gallas speak the 1st language at Arsenal.

Not sure Cole will improve Chelsea that much, Bridge is also a good left back and although Cole is better Bridge has already had 2 assits this season from over lapping. Not sure how much more Cole can give and think they will miss Gallas more.