From what i gather, despite being talentless, thanks to his weird charisma MC became party leader of his (über)team, they rose to the top spot, and forged alliances with other parties, thus setting him in the role as the clan leader as well.
The first chapters have been an recruitment drive for parties within their clan.
The organization is a bit different from what were used to, hunters are members of parties, with the parties being members of the clan. In the end its the party that choose who they want to recruit, not the guild. Thus you have other clan members showing up hoping to get into a more prestigious party.
its very confusing with lots of names dropped and things being translated differently from page to page, mainly because official names and word of street names differ a bit.