An update on the hatch:
3/5 eggs successfully hatched yesterday and survived the night. I opened the other 2 yesterday and both chicks were dead, although I didn’t see anything exactly wrong with them.
Of the 3 that hatched, I have one dark chick(1st to hatch), one nearly white chick(2nd to hatch), and one medium-colored silver-ish chick(3rd to hatch). Ignore the black chicks, they’re from something else.
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The two dead-in-egg chicks seemed to have light colored down.
As for vaults, another other observable trait at this age, 1 and 2 have minimal(sort of just bumps) vaults. 3 has a larger vault. The two dead chicks seemed to have taller vaults as well.