I have had a couple of these in hand (not these particular marbles) and was confident that they were authentic. I think the theory is that they were made when "scrapping the bottom of the frit barrel", so to speak, and that seems plausible to me.
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.