Like my other post: your for-sure list includes 1) will carry at least one copy of red, 2) may or may not inherit frame and 3) may or may not inherit gray.
Because that's not rather vague.
And if you want to make it a bit more messy, that stud probably isn't just frame, as frame, splash, and sabino tend to work in pairs or threes, so there is also the possibility that the stud has splash and sabino and the foal could inherit that. I don't know his name though, so I can't google for a picture to check.