I don't believe Priebus ever took the position that Trump would not be elected. In the primaries, he was pretty good at "hands off," saying only that the party would support the nominee. And after Trump was nominated, Priebus supported the nominee.
Not to say he isn't GOP-E, but at least outwardly and by his actions, he has been supportive of Trump.
Trump does not win WI without what Priebus and Ryan did. Of course, it was in their own self-interest to do so. Look, Trump, as a real estate guy, has had to work with all kinds of people he doesn’t like in order to get HIS PLAN DONE. He will do the same thing as president.
Follow his lead...