There are two things you think of, when a player de-commits, everything else being equal, first and foremost that the coaches are processing him, and they don't want him anymore. This seems to be a practice that all coaches are willing to do. Take commits, knowing full well you might later pull that offer/commitment if it suits you, which is something I'd like to see coaches and teams be publicly embarrassed for. If there's a way we could do that using the internet somehow....
And typically the kids gets the message eventually, and that the coaches have had a change of heart, and de-commits on his own volition.
I can't remember what the 2nd thing is, other than it's of course entirely possible that a kid just changes his mind, and he's no under pressure to de-commit, nor does he feel threatened by the continued recruitment of other RBs in his same class. He just changes his mind....
In this case, we do have new coaches, since he first committed, and there was a big regime change/coaching turnover, so that is a extra-ordinary circumstance in this instance. And at least the RB coach is not the same. Even though if I'm HC I sure as hell don't let no RB coach decide who my RBs are going to be. I effin' pick.... Jesus Christ if I was HC there would be nothing more off limits to any middling assistant than recruiting. That's something for the brain trust to decide....