It's completely random nobs
I've entered through every npc, with same and different pt leaders.
Flame looses because there is this perception that moving down the map is easier and there are many fools that are scared of going up, also now more than ever ppl rq and afk as soon as they see flame nation above their heads.
Idky some idiots qq that its not balanced, I mean really, you QQing because you never got in the best nation? It's random. If you don't like the randomness go play real life, maybe you get more luck there and randomly get hit by a bus