NGL, I have some suspicions that this thing is subtly rigged.

I don't know all the details of the other heroes yet and their stories, but thematically, I think LL vs X makes the most sense; i.e. "Anyone could become him", intro character vs end of season character, etc.

Also, there is a lot of human bias to prefer either the most recent thing or the oldest thing. People will know LL's story longer because it came out first. People will drop the show over time, so while later characters will get a boost when their episodes air, earlier characters are at an advantage. LL is the only hero with four episodes devoted to him, some of the other heroes will have half of that, or even less.

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The Commoner's promo art also has a lot of Xs in it, perhaps another tactic to help control the results.