He wants attention and he also wants to attack Jeb Bush on the debate stage.
Mostly this. I suspect that he wants to be president, but he knows it's not going to happen. He's going in to take Jeb down to clear a path for someone else, possibly in exchange for a cabinet spot, but possibly only because he knows Jeb can't win and he doesn't want to see Hillary in the White House. In so doing, he'll get the attention he so loves, as well as an outside shot at becoming president.
So, 9, but he knows it won't happen, so 6, possibly in exchange for 3. On the upside, he gets 4, maybe a look for 1, and an outside chance for 9
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