Different actions, different consequences, instead of Final Getsuga Tenshou, Zangetsu and Ichigo's hollow side decided to fully merge with Ichigo to defeat Aizen, but the act also sent Ichigo back in time before he rescued Rukia, what will Ichigo do now?

What would happen if the Final Getsuga Tenshou was not enough, What if Aizen was able to make Ichigo a full hollow? What if Ichigo became the first perfect syncrinisation? here is my interpretation if things had went just a little differently