I imagine Pete Townsend would have also been a great "smashing guitar teacher" had he taken that route. :>)
My own great teacher was a golf pro, Steve Anderson, who gave me a series of 6 lessons about 7 or 8 years ago. He only showed me about one thing per lesson and I wondered if I was getting my money's worth at the time. Well as it turned out I've built a pretty decent swing and short game using the fundamentals he gave me which really enabled me to teach myself.vl