"Top X challengers are mostly toplane mains"
NO ONE CARES
Did you ever learn how statistic works? The lower the sample is the higher the fluctuation is? If you fucking take top 10 challengers it DOESN'T MATTER AT ALL, in statistic we take like 1000 to study something , no one is going to take you seriously if you take 10 people that you choose yourself because YES taking only the challenger elo is a BIAS OF SELECTION
https://en.wikipedia.org/wiki/Selection_bias
Want to know how popular the toplane role is? ask the bloody Meddler
"One other thing worth talking about with top lane is how it changes significantly at different MMR levels. Looking at popularity for example top Lane’s the middle position in terms of popularity at almost all MMR bands, noticeably below mid and bot, but significantly above jungle and support. That trend changes at really high MMRs (top 1% or so), with mid and jungle then the two popular roles, with bot in the middle and both top and support a bit below it"
So stop **ing around and change the facts with biased stats, Toplane IS the least popular role with support in higher mmr
And just because few people among the 10 best players are toplane mains it doesn't change this fact not a slightest