None of the things you're describing have any effect on the plausibility of the story because they're all exactly what you would expect to happen either way. If a Trump supporter became aware of this sort of thing, he would bring it to someone like Giuliani, who would bring it to someone like Bannon and so on. Then they would sit on it until now because that's standard procedure in politics, because damaging information has more impact when released just before the election.

It tells you that the story is being maneuvered for political advantage, because obviously. It tells you nothing at all about whether or not it's true.