If you really must know, one of those people is a personal friend of mine for whom I
know he can barely contribute spacing and comment alternations, and it's just bizzare that he's on the list. Others' presence seems strange either because I don't recognize their username (and I really should, having reviewed all pull requests for the past few years), or because I remember them for being so irritatingly clueless that I'd never ever imagine them being top anything.
No disrespect to any of them, and I don't really mind the list. It just seemed strange and hence I wanted to know what the criteria is. No need to blow it out of proportions.
At the end of the day, it's just a simple algorithm and I guess that's just who our contributors are - a few frequent/high-volume ones and a lot small-time ones that can swap places any day.