Cygnuses are unavailable.

if there isn't any instructor class covers for Strikers, why not?

it isn't Mikhail which was used for Soul Masters and later came up with as a class itself

When Dual Blades get revamped, do we see Lady Syl being used for the artwork, or a generic DB?

Sometimes Nexon use the class instructor as representing the class, sometimes it's a generic member of the class. Nor do they have to continue using the same representative in subsequent patches. No need to make such a big deal out of it.