Best buyer for Opel brand

Hi all, this is my first post in this site, and i like open this new thread for we can talk about the sale of this good brand.

Until now seems the groups more interested are Fiat and Magna, and i get surprised because i don't see other strong groups interested in Opel.

My question now is: what would be theorically the best buyer for Opel?

And if not are Fiat or Magna, a second question can be: why are not interested?