So there's the real story. Who is this financer (or group) with ~40 billion in capital that is willing to bet long on Tesla? That's really interesting to me, if Musk is being truthful here.
I highly doubt it. For starters his wealth isn't liquid enough. He would need to give up shareholder control of Amazon or take on huge debt with his control of Amazon as collateral.
Google/Alphabet. Larry Page has stated that instead of giving away his billions to charity he would prefer to give it to someone like Musk that is trying to fix world scale problems.