That's a borderline rude thing to say, since you are talking to people who are trying to help you. Why would someone not want your marble to be guinea? If you don't want honest responses, I recommend you not ask for ID help.
The top ones look the most Heaton to me. Lower left might be Ravenswood and the lower right might be Alley, but I think some of these could go a few directions.
Well, there is everything from soup to nuts in this lot, which spans many, many, years of marble production. All I can say is that I hope you find some good ones!
You're on track, left and lower are Buttermilk variants and the upper is a Superior. The best Buttermilks have less white showing but these are really great marbles, regardless.
Huh, I didn't even notice the blue until I enlarged the photo - i was thinking it was base showing through white or something - you know how it can look sometimes.
It still looks foreign to me, I don't recognize it as anything American.