The sloppy unevenness of the striping would basically be referred to as Cuckoo since it's smudgy. The feathers are on her tail, & upper rump in the tail area.
Barring is a gene that causes an absence of color resulting in white bars. The appearance is very similar.
I don't see cuckoo there, either, just one stripe, a white tip, and some fading. That doesn't really scream 'barring' to me, I guess.
A triangle is different from a straight streak, though.
I didn't notice the one off to the side when I looked at the pictures initially, but I looked at Flury (my Splash Cochin) this morning and she has some of those, too. I really do think these weird feather patterns are a mechanism of pigment distribution more than anything weird genetically.
I still can rule out vitiligo, cause a high percentage of those infected by it have visual impairments, like decreased vision, & blindness. Mine don't exhibit those symptoms.
Apart from the Chameleon hen's Mother being half blind in one eye from an injury she got when she was young. Took along time to treat that. She was pierced right in the pupil, by what, I haven't figured out yet.
I would still argue that your birds have vitiligo, just not the kind that causes these issues. The definition of vitiligo, according to Oxford English Language Dictionaries, is, "a condition in which the pigment is lost from areas of the skin, causing whitish patches, often with no clear cause." I emphasize the 'often with no clear cause' part. Some vitiligo is associated with vision loss and blindness. Some vitiligo is associated with severe autoimmune disorders. Some vitiligo is associated with stress or other external causes. But not all vitiligo. Your birds fit the bare definition of vitiligo as I quoted it, we just don't know what exactly the cause is in your birds' case. It's sort of like saying that the sky isn't really blue, it's actually celeste, as if there's a difference.