Okay, I know it seems ridiculous, but I actually disagree with this one.
When it comes to A-skill, Heavy Blade 4 seems useful, but I don’t think it’s required, and I actually like the defensive utility DC gets. Raging Storm and Galeforce is a great combo, but it’s hard to get to three KOs in one round without one of them being a dragon. She doesn’t double anything else naturally, so either she misses a KO by not one-shotting and an action is wasted, or she one-shots each and misses Galeforce by one charge after taking out two enemies. Either way, it doesn’t get her much until she’s already been in combat, which means she’s near enemies already and needs Enemy Phase potential. I find DC more helpful, not just for beating ranged foes who otherwise try to cheese her and can leave a sizeable dent in her HP, but also for charging up that Galeforce during EP so you go into each player phase with the guaranteed three actions. Both are solid options, but DC is admittedly much easier to acquire, and I think just as useful.
As for the seal, Heavy Blade is better there, but I don’t think it’s quite required for the same issues as the A-skill. You still miss out. I’ve found a Brazen skill to be a lot more consistent, because she just doesn’t take damage, and another 7 attack means virtually everything is a one-shot.