I feel he has already given up all that is important to him...his friendship with Luca, his time in the world, his heart...now, he pretty much only has his fighting strength, his memories, and his sense of self. I don't think he can do anything without them! Especially not without his memory, since he doesn't have anyone to pull him along.

Hm, not sure it works that way with Yuuko (paying before the contract). Unless, instead of going to Purgatory for 100 years, he gets stuck at Yuuko's side...?

I think he only needs more time on Earth. Or possibly mortality?

And we've only been getting disembodied voices for Luca every time he's coming back now. I wonder what he looks like now. Possibly he might even look the same as before?? That naive looking boy?