It seems to me, IMHO that having instructors with a variety of techniques is beneficial. As has been said, different students will work best with certain instructors. Personalities, interest levels, styles will all play a part in the successful mix.
I myself have found that in both THSCC schools and in Evolution schools that I've attended that I tended to absorb more from certain instructors that others.
Two of the best instructors for me at THSCC schools were Eric Peterson and Tim Aro. Both of them immediately tuned into me personally and worked with me on what I needed and how I needed it presented. Mary E has a talent for noticing small things that may escape others and makes you feel comfortable and capable.
Even though the Evo instructors are all teaching the same techniques on the same courses, the way each one approaches it can be quite different, and of course they have to adjust for the needs of the student as well. Each time that I've worked with Sam Strano I've learned a lot about myself and my mental exercises as much as techniques in driving. I've learned a heck of a lot about driving, in my style, from Jr. (Mike) Johnson. It varies for me and it will for anyone. For instance, Jr. always leaves me wanting to have more time to work and Sammy always leaves me in deep thought.
As far as LFB...
Some people would be or are very good at it, some people are not and have tried it and will not try it again. Different strokes...make the decision for yourself. But if you don't try it, you won't know. Some cars also react better or worse to LFB. Shawn Whipple discussed that very thing with me last year while I was contemplating LFBing.
Myself, I practiced it for about a year on the street before trying it at speed in an autox car, but even then not in competition. I spent an entire two day test 'n tune practicing it in a car. My first competition LFBing was at the Pro Finale this year. For my driving style, LFB worked well for me in the cars in which I was competing, a Mini Cooper and a Mini Cooper S. I tested a friend's Celica while LFBing twice. My first competition LFBing in my Celica was at Sanford ten days ago. I need more practice in my car I think. Timing and amount of pressure become even more critical when trying things with a different foot.

Could I help someone who wants to try it...yes. Will we be successful...good question probably not, but that's the point of trying something new, an introduction. I rode with Carl Fisher and watched him LFB in the Neon last year to get some insight. If you're curious that's the way to go too.
As far as RWD, FWD, AWD...
I have had the opportunity to drive all three. I feel most comfortable competing in FWD, but have taught in all of them. Teaching the techniques of autocrossing remains basically the same. All of Andy's tips apply no matter what car you're in. Posture, seat position, looking ahead, scanning the course all remain the same. The best technique for that particular car may vary according to set up, surface and style, and certainly if you need set up help or insight into your particular class and car then someone intimately familiar with a similar car is ideal IMHO.