Not sure if you're making Rosalinda cultists joke or not XD but tbh both of them kinda suck in neutral, and this is like the only MU in which Zelda can actually force an approach with Din's Fire because it's either that or Luma dies to explosions.
In any case, literally anything Zelda does will kill Luma. Like, literally everything. It's just a matter of separating them with Nayru's and then going for Luma, after that it's a sitting duck match, lol, but yeah, Zelda's pretty good at getting rid of the starlet.
Without Luma their killpower is super imbalanced in favor of Zelda too, and Rosalina's recovery is super easy to intercept for her, soooo...
Of course, that's not to say Luma doesn't exist. If Zelda can't get a good opening to get rid of him she's gonna be in trouble really bad. Also, yeah, Zelda is way too easy to juggle for Rosalina because they're both super floaty as well.