well, i think i'll just power up my assist cards, then.I can't be sure about the stats because I can't HP that card, I don't even have it. All I can do is rely on jwiki and I've just checked it again - that's what it says 11274/11274. So yeah, pretty low stats, other cards are not exactly top tier either :/
I don't get the new new missions, I already helped to defeat a high level Trident Anchor but didn't get a reward (or the mission to begin with).
i got them after i finished a mythril mission, try completing another mission and see if they pop up.