At the risk of being a little melodramatic, let me tell you a story.
The year was 2013. Ole Miss suddenly won the commitment of Laremy Tunsil and Robert Nkimdeche. Eventually, they finished with a Top 5 recruiting class. Add to these the now-familiar names LaQuon Treadwell, Evan Engram, Tony Connor and Austin Golson. One day, I said to
@MrsDrJacket "Something smells over in Oxford. You can't go from being the doormat of your league-- even the doormat of the SEC-- and suddenly start landing the highest-ranked recruits in the land. Not overnight. That's too much culture change to explain in one class."
I still hold to that theory. I watch Tennessee in much the same way lately. I had said a similar thing about UNC a few years ago, as they were getting in the mix for recruits they had no business competing for. Sometimes it takes a while to surface. But, I believe these overnight recruiting successes are tough to pull off without something being wrong. Could the "right" coach/staff set up shop somewhere and swing the desirability of a school quickly. Of course. We see it only very occasionally. James Franklin did that somewhat for Vandy when he went there. But, James Franklin ain't there these days.
Am I saying that Vandy is cheating? No. But, I am saying they bear watching for a while. Closely. If they're clean, then they've got no problems to worry about.