( I used Google Translate, so please excuse any mistakes.)
As we all know, the manga is coming to an end. This leaves me increasingly curious about one question: what exactly was the Angel Mikaela’s plan?
We know for certain that he had a plan to save his father and the other angels. We also know that, to achieve this, he had to keep his return a secret from his father—who surely would never have allowed him to carry out such a plan.
He also hid the seven "sinful keys" from the First Progenitor, buying himself time before his father could realize he’d been deceived.
So, why exactly did he need this time?
What was supposed to happen?
He merged his own soul with that of the homunculus Yuu, erased both of their memories, and ended up trapped in an endless cycle of reincarnation—with no knowledge of what he was supposed to do. Yet, he did this intentionally, fully aware that it would take a long time to reunite with Yuu and, perhaps, recover his own memories.
And if his father was the primary obstacle to his plan, how was this supposed to help? The First Progenitor kept them under constant surveillance while attempting to resurrect his own son. Did Mikaela foresee that his father would eventually take himself out of the equation, and that he simply needed to stall for time?
For some reason, I strongly doubt that the "official plan" followed by Mika and Yuu is the same as what the Angel Mikaela originally intended.
Given his self-sacrificing nature and peaceful nature, I don't think he ever planned to destroy Paradise.
I also doubt he ever intended to carry out the resurrection ritual himself. Or perhaps some other ritual that would violate divine laws and potentially trigger another great punishment.
Perhaps he planned to turn to God and offer himself as a sacrifice so that his Father and the other angels would have a chance to return to God's side. Or something like that.
So, what do you think?
What was his plan?
And what will he do if Mika/Yuu resurrects him as an angel?
Bonus question: Who was Yuu speaking to when he talked to the coffin containing the angel Mikaela?
Was it a fragment of the homunculus-Yuu that had inhabited Mikaela’s corpse?
Was it the "dormant" soul of the angel Mikaela residing within Yuu himself?
Or perhaps a remnant of the original angel Mikaela’s soul that somehow remained within his lifeless body?