Who gets Wind Boost and Distant Defense

Do you have any units with Sword Valor? Cause that may be the more useful skill from Gray honestly. It's also part of the only reason I still have my level 40 rather unbuilt Gray, for when one of my other swords needs to level up/grind sp.

Doesn't this depend on who's currently on your roster?

if u dont have lene then i suggest giving sword valor to an olivia instead. otherwise, if you get/have karel then he can run wind boost pretty well especially if u combo it with a firesweep sword. even marisa has the stat line to run that build but boosts are incredibly ineffective and unreliable unless you run like a brave build and dont plan on taking damage.

Wins boost is just for high hp sweepers, though unfortunately Swift Sparrow is strictly better due to the atk increase. Fodder him for Sword Valor if anything.
Distant def is for DC units who need help at a range like Dorcas Hardin or dragons if ya don't have a breath skill really. Works good on mage tanks too

Wind boost is kind of useless. I find the +3 hp requirement to be just too much in the most important cases and units who usually have high hp don't really need a speed increase (armored units, dragons and couple regular infantry cases). You're better off with inheriting Zanbato imho, which is actually pretty useful.

Not sure about Distant defense because there are lots of possible candidates. Enemy phase mages are the obvious choice (Julius, Deirdre/Julia etc.) but you can also go with a guard bow archer or Felicia (more of a meme options). You can also kind of use it as a budget-ish substitute for steady/warding breath for DC units (it works on cavalry and flyers as well unlike those breath skills) and combine it with close defense seal to make them tankier against all damage sources.