Mariudeth is bad for frontier hunter because the scoring is all about quantity, not quality - i.e. number of hits on dead guy, number of sparks, number of weakness hits etc. There's also not very many fire guys, and a lot of earth guys, so ulkina is probably a better choice.
I don't know. I got my highest score with Mariudeth, and my scores dropped off significantly when I removed him. The crit buff plus water element helps a lot (I can never seem to OTK the Vishra round without him). I suck at figuring out FH though.
I go with Maxwell (lead, Amano, Sol Creator), Elza (Legwand, Ihsir's), Zelnite (Lexida, Sol Creator), Luther (Steeple Rose), Mariudeth (Dandelga), and whatever Maxwell friend has the best combo (I like Amano pairings).
Attack pot every round, fujin on Zelnite, Luther and Maxwells round 1. Swipe order Luther --> Maxwell --> Maxwell --> Zelnite --> Elza/Mariudeth
Rounds 2-6 swipe order Mariudeth --> Luther --> Maxwell --> Elza --> Maxwell --> Zelnite. I've played around with this a lot and it seems to do the best. Maxwells at the end sucks for some reason.
I'd ask for advice, but at this point I don't care anymore. Ideally I would have leveled my Michele SBB, but I don't have time. I tried running Kuda (Amano, Sol Creator) in place of Mariudeth and it ended up with a lot of 2 round kills.