Sadly from my testing so far Cyrtanthus's other skill (+30% attack on raid bosses) does not seem to apply to the level up RB. The squad with her was just somewhat ahead of the other squads, but since its all slice type that's expected. On the summonable RB from the Adonis event, a team with her ended up pulling further ahead of the other squads by a more significant margin. I'm testing a slightly tweaked team setup now.