my dude, that's something OBVIOUS. there's no absolute, empirical way to know the "best" at any given sport or activity because not everyone has the same concept of "best" and what it actually means. there's no actual best player whatsoever. same as in football or anything else.
the top20 ofcourse grossly ressembles, statistically, the list of players who are more influential to the game. but from that, the actual n°1 spot will always be a close battle between the top3, there will be variability in that. and any other spot in the list anyway. n°1 could be split between the first 5, n°10 could be anyone from 5 to 10, and so on. it's approximative but not perfect.