Haven't done Score Attack EX yet

No particular encore gacha this time either, I guess it's just good that you can keep exchanging pieces. I tried putting in a new character for the easily forgotten Alternate Layer EX, but it feels like it's for people with a thin debuff layer. Honestly, it feels like it's for new players? But recommending some obscure character to new players is also... (There are characters you end up disliking the more you know them, so maybe characters from scenarios you won't reach for a while are better...?). I thought I'd do Score Attack EX after the Admiral Gacha Challenge, but it seems like I can do it with lightning, though I feel like the people getting amazing scores usually have Aichin, whom I don't have. Is EX quite flexible if there's no no-break bonus?