[Huh...?]

Originally Posted by Twi

Spoiler:

I would have honestly accepted that Leon died at the end since the Marie Route has always been darker. If anything, I would have loved if he confessed he knew that she was his sister in his previous life and he still fell in love with her, since despite the taboo of it he was happy with her. And with all the overpowered AIs and evil Saints gone, the world would have had a genuine chance at improving.

But a do-over that basically makes it a prequel to the Main Route just invalidates it and even the bad parts of the main series are made justified because the author effectively said that anything he did before wasn't as good as what he did in the main series. Even the parts where he was being proactive.

I'd take a bittersweet ending over that any day of the week.

I read somewhere that apparently Author had confirmed in-story that Marie & Leon in Marie Route weren't related in their past life.

Aka., while the Leon of Marie Route & Main Story are the same one.
But the Marie from Marie Route and the Marie from Main Story are both different, hinting towards a Parallel/Multi World aspect (it's possible that the Brother of Marie from Marie Route was actually reborn as Leon Sara Rault in the Main Story and died early).