It appears that Elon Musk is serious, or serious enough, about buying Twitter that he has begun unloading a substantial portion of his stake in Tesla—and collateralizing billions of dollars more—to furnish the $44 billion in cash he has promised the Twitter shareholders. Of course, as I wrote earlier this week, the fate of this deal over the next several months will likely come down to whether Tesla stock holds up. If it does, I think Elon will end up buying Twitter. (I still can’t figure out for the life of me why he wants to own it, but that’s a discussion for another day.) If it doesn’t hold up, I think he pays the $1 billion break-up fee, walks away from the deal and moves ahead with his famous Plan B.