You could be right. They might even have a number one choice to do that, and a number two choice to do that. (To see which one is number one, and which one is number two, just count the hands in the pictures below.)
The point is, the Rats want someone with “gravitas”, at first it seemed it was Biden, but he’s falling by the wayside, that pretty much leaves Hillary.
She can stay above the fray, until basically they beg her to run.