Originally Posted by Gamabunta
You're just cheerleading Isshin to be from zero squad merely on baseless hype and your favorite, "kael post showing Isshin is not from 10th division thus he could be from anywhere". And you side-step my question after failing to provide more than pointless Isshin flicked Aizen as a merit he could be from zero squad.
You're showing that you have no idea what process of elimination is. kael's post reveals that the only two viable options for Isshin where what I've stated.
You also asked what was Isshin's contribution to become Zero squad. My answer was he developed a technique that allowed the shinigami and zanpaktou to essentially become one.
Isshin is not the protagonist of this story. Ichigo is. That's why Yama, Isshin, nor Urahara took down Aizen single-handedly themselves. It took Urahara placing a kido inside of Aizen and Ichigo pushing Aizen to that limit with his final Getsuga Tenshou. Yama never did jack-shit to Aizen, never. Hell, no one is SS did. The only people to show that they could go toe-to-toe with Aizen have been Urahara, Isshin, and Ichigo.
You keep asking me to prove that Isshin is Zero squad, you can't prove he isn't. Not until Kubo tells us. There has only been one manga that successfully crossed over to the western world that didn't have the father of the protagonist not be of higher/noble standing... and that's Dragonball.
And just so you know, a good writer doesn't give away the reveal until the right moment. It would have made zero sense to reveal that Isshin was from the Zero squad when he was fighting Aizen. The Zero squad hadn't been introduced (literally... and it would have been way out of place considering the events that followed). It would have been an orange in a bushel of apples.