that was different, that was some lljk siding with one group, while another sided with the other side
More specifically, it's because LLJK doesn't really have any rules for signing up in battles that aren't ours. We'll encourage our guys to sign on for people we like, but there's really no consequence if they don't. In the case that was brought up, Goretooth really really wanted to fight for the Hospitallers because he has several actual friends in that clan and he wanted to fight in what promised to be a pretty epic battle.