lets say 'even' is not exactly the best word to say it.

why?

while it's true the ninjas you and your enemy can choose among is the same, is not true at all how good they would fit in with your main character.

would be fair if they let you choose your main after you saw what ninjas are there, but since they don't let us do it then is not 'even', it's just based on luck with 2 mains (wind and water) generally advantaged over the others and 1 main (fire) that depending on the ninjas appearing there may be ultra op or wholly useless (if gnw ino/ino swimsuit, itachi susano'o and shisui are there you are god, otherwise you are doomed), while, on the other hand, earth and lightning main are always subpar regardless the pull of ninjas, because they simply do not work with low points ninjas lineups (if you go in with them you should have some kind of advantage, like getting 10 more choosing points, or sure 3 rounds of initiative or start by default from 2-0 on your side, to actually be on even grounds with water or wind mains).