I think the thing again, with regards the chances versus goals, is how AVB is using the two players involved.
With Adebayor, he has on his hands a player who is lacking confidence in front of goal and has a poor conversion rate. In Bale, he has a guy who despite missing the odd sitter cannot stop scoring. With his options limited as they have been, he has recently deployed Ade as part of a formation and not necessarily an out and out striker. Indeed, anyone watching recent game would think that Bale is our natural forward and Ade a co-forward who drifts and occupies defenders. The system is currently set-up to accomodate Bale...I would say too that any striker right now will find it slightly touhger (Defoe included) without the drive of Sandro, who does tend to shift the ball forwards quicker.
JD did look sharp though, which is good news...