My moirail has this idea that because you never see a dead Gamzee in any dream bubble and it was stated (before Gamzee's death) that Gamzee can't die then what if there is only one Gamzee and all other timelines don't have a Gamzee therefore we ARE reading about the alpha timeline because the alpha timeline is the one with Gamzee. Is there any proof (other than what I said) that can prove this theory or did my moirail just pull it out of his ass like he always does?

The reason there’s no dead Gamzee’s is because he can’t die and his alternate selves from doomed timeline are still alive when the timeline is erased so he is always erased along with it.