Hmmm...I see.
So, canonically, chapter 15 in-game has you only fielding Alear, Hortensia, Ivy, Timmera, Panette (RIP Merrin coming I guess), and Alcryst. Not a bad spread all around. Even on Maddening I can see this working, especially since Seadall joins not long after.
So that's how they extrapolate Goddess Dance based on how it is in-game. In-game it's just a 4-way unit refresh, but here it makes the recipient of the dance move faster (possibly in addition to being refreshed). Hortensia is a flier and the flier bonus for Goddess Dance gives resistance (covert units (thieves and archers) give speed as their bonus), so that's interesting but I get it.
Overall, good chapter. We see Alcryst still hesitant to forgive Ivy and Hortensia, which is neat given it felt like after chapter 11 in-game that bad blood between them just magically disappeared. Alcryst is starting to come around, but I'm glad to see it's more gradual here.
Thank you for the translation.