Seriously, the 3.2 cutscene following a particular melee offered a heavy lore perspective towards all of the GC leaders to condone the participation of the WoL in GC vs. GC battles regardless of their current affiliation. They don't even need to try hard to think of a reason for why this would work from the perspective of coming up with an excuse, especially since Sephiroth EX's lore explanation was a total joke.