This guy must be a ghostwriter for the infamous Nixon dirty trickster Donald Segretti. The piece is total drivel. Sanders, as much as I like him, has no shot whatsoever at the nomination. None. Zip. He has few superdelegates, and it is very likely he will be out after Super Tuesday.
You don't have to be a political science expert to know this is true.
Sanders is not in the contest to win the nomination. He is there to help get the "left" base in the party involved, to help drive policy discussions, and to prep Hillary Clinton for the fall campaign.
I think it was determined long ago by the Clintons the GOP would put up either Kasich or Jeb or both for the nomination, and I do believe when this is all over this will be the result. It is possible Trump could pull it off, but I doubt it. If either Kasich or Bush or both are on the ticket, rest assured Donald Trump will run third party and totally fuck up their chances in the fall.
Remember, the GOP needs Ohio and Florida to win. This election is really about the stolen elections of 2000 and 2004. To use a noted Segretti term, Trump is a ratfucker for the Democrats against the GOP, and so far he is doing a great job of it.