This isn't entirely true because the slayer cards multiply each other as long as they're in your hand, as you can tell from the screenshot I posted earlier.
Sexy should have 3x multiplier vs babe, but even though all my Sexy are level 100 with ex levels, they lost to babes, meaning multiplier is higher than individual cards.
So for a person with 4 slayers, the R doesn't max at 10404. With 4 slayers that 6120 card becomes 70747. Even if Lilith had the type advantage, she maxes at 13135 with 5 ex levels x 3 would only be 39405. So yes, the highest sed card would lose to the R card.
Also, on that note, if you did 5 slayers, even the N card would beat every other card if the N card had type advantage.
2700 N x multipliers = 37454 x 3 for type advantage = 112363