The kinked sibling has an incredibly blocky pattern as well with side pattern being pushed together, it's just less drastic and doesn't have as much black on the dorsal. Interesting. I think it's worth seeing if it passes down from the surviving OS.
The holdback Spider girl looks a lot brighter than the others, but perhaps there is a difference in lighting between pics? Very minimal side pattern on her too. How has she held onto her color?
Nothing glaringly obvious but there might be something going on there.