I think recent episodes marked a crucial point in Lars character development. He did some really cool and heroic things. He got a cool scar. He is currently the most brave person of off-color Gems (Let's just call this group of Gems on homeworld the off-color Gems) and it looks like they don't have a leader so it would be make sense that he would become the heart of the group, right?
I don't mean leader like a tour guide, he would be the moral anker of the off-color Gems, make decisions, like helping other Gems in need as occasion arises and make speeches.