There's a correlation between goals from corners and league position too, I believe.I wasn't saying that there was. Indeed, surely the lack of correlation indicates that some teams are better at converting corners into goals than others (there would be perfect correlation if every team was exactly as good as each other at defending and attacking corners).
What point of mine were you disagreeing with, and/or what point of your own were you trying to support with the lack of correlation?
It would suggest that working on corners either has a detrimental effect on the rest of a team's play (logical, assuming training time is finite), or that it's the last resort of desparate teams (also makes sense - the risk if losing possession matters less if you're unlikely to keep the ball anyway).