Frost came in wanting to do things the way he felt was the right way. Rather than going for a bunch of quick-fix JUCO & transfer guys, he wanted to build for the long-term with guys he picked out of high school, redshirting as many of them as he could, with just a couple top-notch transfers as needed. I think a lot of us were behind that idea when he was hired.
But the 2017 class that Riley left Frost with was just plain disastrous. Almost all of them were gone within two years. Frost's own first class didn't fare a whole lot better. Frost's 'build for the long-term' approach was great in theory, but the implosion of two whole recruiting classes just left too many holes in the roster that couldn't be adequately filled by young and inexperienced guys. You look at the roster, and going into year four we were still really young in some position groups, most notably the offensive line.
I think what we're seeing now is essentially a tacit (and belated) admission from Frost that he's failed to build the kind of experienced core that a team really needs to be successful.
Better late than never...