For job predictions, I'm going to say dancer sharing Scouting gear with ninja. Even if it's a healer.

I'm not sure of how previous lore for dancer has them casting spells, but it seems logical to me that if it involves making particular movements (in the same vein as ninja's mudra) then dexterity is the stat that will give them that ability to perform well. In contrast to other healers that need less physical, more mental effort to channel their particular magicks, thus benefiting from the Mind stat.

Also if they've been planning it for a while, the Scouting gear seems to be setting up for it. There are things like the Ghost Barque Himation (shared model with mages' Star Velvet sets) that seem an odd choice for ninja, but would work great for dancer when it hypothetically becomes a future user of those sets. (And there are a few themed sets where Caster-and-Ranged and Healer-and-Scout gear share models, rather than the usual split between mage and DPS sets.)