Of course you can question the technique of Segovia, Robert Johnson, Joe Pass or bert Weedon.

The whole field of guitar playing is full of oddballs and outlaws. You can question the rules, ignore them, wipe your bum on them -if you want.

Passing on ones expertise to adults is naturally more difficult than teaching to kids - they ask questions. They have heard lots of musicians - they soon pick up if you are putting them in the wrong direection from where they want to go. An honest teacher will say - if I can help you, Iwill - but if I can't help you, I will level with you.

Its a multi faceted instrument - no one knows it all.