It's like MarisaC vs ReimuB in MoF~
When using Scarlet Team... If the boss doesn't move, you can plant your bats right there for about 50% of your total damage output no matter where you are on screen. Notably most of Kaguya's cards or some of Reimu's, maybe. If you unfocus, your bats will move with you but it's the same way with Border that you need to get a lock on again for Ran when you refocus. In both scenarios you need to get under the boss again if you need to unfocus.
If the boss moves and if you stay in one area, the boss will always move towards you, so the boss will always be in the general area. Yukari might win over Remilia in this instance depending on the movements.
If you move, the bats will continue to stay under the boss until the boss moves towards you, in which case you can just tap focus to move them back right underneath.
Of course, you have to deal with Sakuya's terribad shot, but it's mainly for those reasons that MarisaC will win against ReimuB (at least against VoWG lololol) no matter how much power you have.