Now, I'm not saying that it's impossible, but until I hear from the established guys saying it's definite, I simply remain highly skeptical.
David Johnson is an Ole Miss homer, and hardly has an established record. Almost every rumor claiming that Deuce Knight is flipping to Ole Miss references Johnson's prediction.
Some will say that Tom Loy wrote an article about Deuce Knight possibly flipping, but probably didn't read the article. In his article, he stated that Ole Miss is heavily recruiting him (true), and that they would much like to keep him in-state (true).
However, that's the extent of what he stated. I haven't seen anything from Loy (or any other established guy) claiming that Knight is flipping. If anything, the way Knight is trying to recruit players to come to ND says more about things than Johnson's guesswork.