as long as they're water so you can also get the "clear only with water hime/souls" done as well. only time you can throw any R in there is if you go off element.
it's why i hit the issue with floor 6. i had to save those hime cause a lot of them are useful in the next few floors. i can still get more mission clears from the water team but after that, i'm spamming the fuck out of my light grid.
i may have 172 hime (as of right now), but the totals are as follows:
Fire R- 11, Fire SR- 13, Fire SSR- 7
Water R- 10, Water SR- 12, Water SSR- 3
Wind R- 9, Wind SR- 14, Wind SSR- 4
Thunder R- 9, Thunder SR- 11, Thunder SSR- 4
Light R- 12, Light SR- 11, Light SSR- 9
Dark R- 8, Dark SR- 17, Dark SSR- 7
So I'm only shuffling around 25 water hime if I want the elemental advantage missions..... even with a good grid. and considering there's one "5 survive" mission on the way, that's about 12-14 hime minimum per "cooldown cycle". and a lot of them don't have that great of a kit on top of that (or it's very situational) so... that makes it worse.