My last match was Akali, Jax, Graves, Amumu, and Nidalee vs. Katarina, Vayne, Lux, Yorick, and Warwick.
So lets break this down. Jax and Graves are mercenaries essentially. Akali fights to maintain balance. Amumu and Nidalee I'm really not too sure on. Now, there's two ways to look at it, though one way is obviously more logical. The logical way is to look at it as champions are to be summoned at the behest of a summoner, regardless of affiliation of the champion. This isn't to say champions aren't in the League to represent their city-states, most are in it for that exact reason, but moreso champions are there to show their individual power, thus projecting the power of the city-state.
Sadly, the summoner controlling the amumu on my team was a less skilled summoner, and the summoners controlling Jax and Akali obviously had alterior motives to cause the team to fail. As such, even though the skillful summoner that summoned Graves would do very well(17-8), he was not strong enough to carry two corrupt summoners and one novice summoner against a mostly competent opposing team.
Probably just a fight for inner-League politics.