So does this mean gamzee went insane cause a part of his soul (an insane part) has been cycling around the alpha timeline becoming part of Gamzee when he finds call and being physically removed and sucked back into lil cal?

When Gamzee looked into Cal’s eyes the piece of his soul in there probably told him everything he had to do for English to rise and that he was part his two mirthful messiahs. Which lead him to do everything he did and eventually end up right back there in Cal.