Dan White wasn't throwing shade at Butch.
Because the phrase is not Butch's. It is identified more with this guy. Jon Gordon. Author of some best-selling leadership/self-help books, like
The Energy Bus (2007) and
The Power of Positive Leadership.
See, Gordon was famous for using the phrase "energy vampire" in those books long before Butch borrowed it.*
So Dan was acknowledging the work of an author who is pretty well-known. He may not even be aware any of our former coaches ever used the phrase (remember, at the time he was somewhere else focusing on other programs and their needs).
Go Vols!
How to Deal with an Energy Vampire
* Even Gordon didn't invent the term, that goes back at least to a 1970s rock song.