It depends on what you're using to qualify "biggest." For example, he is one of the biggest variety streamers on the platform. He has a large amount of subscribers but probably not as many as say Ninja or Shroud. He does very well with views though.
To this point, I'm surprised no sexy/risque/lewd photos of her are leaked either. Either the guys are too Beta or they're too afraid of the legal repercussions. Or both. Or she's never sent any - but no nudes in 2019? Doubt it.
The difference between her and Chance is that Chance is enjoyable to watch. Whether he's streaming by himself or with his friends playing WoW or any other multiplayer-type game, he's funny and his antics keep the audience entertained. Younger kids watch her because she's, in their eyes, attractive and she puts on the doe-eyes for people to thank them for subscribing and donating. But I'd wager most people are turned off by the shrill, over-the-top reactions as well as master level self-examinations such as "I dont know why, but I love ratchet music."
I doubt it and you should take it with a grain of salt. LSF tends to get decently brigaded by viewers of various streamers. At times you'd think LSF loves Destiny and at other times they hate him. Repeat for GGX, Trainwrecks and literally anyone else.
He's a self admitted beta, honestly. He doesn't pretend to have any sort of game or macking skills or anything. A lot of the time he doesn't even want to bother with the social interactions - it's too much. He's perfectly fine just masturbating by himself, playing WoW and having a good time streaming and, honestly, it's kind of refreshing. LegendaryLea is a bad mark in his history with girls but since her, I'd say its been fine.