Ask HN: # of Followers = function of avatar size?

I'm going to toss up a wild postulate. Over the entire Twitter ecosystem, my observation is that the larger your profile pic is (full size e.g. click on square avatar to view), the larger # of followers you have. Anyone want to prove/disprove this? I'll be the baseline: http://twitter.com/grantschultz ... pic: http://a3.twimg.com/profile_images/1160716843/Day5-2.png