I fail to see the parallel. If the topic were calculus and the question was one author's ability to explain it vs. another would you still drawl the same parallel?

Good point, I see what you're saying, but...

Bad analogy, though, because we're not talking about an instructor's ability to teach a scientific subject. We're talking about the end-result classification details, not the ability to teach the system.

A better example, using your same analogy, would be... What if all calculus teachers got different answers to the same equations? Which teacher would be the right one? And how would you know? And more importantly, how would you test to be sure which one was right?

Specifically, what did you read?

I have deleted most of my links, but I recall spending a lot of time reading stuff at http://keirsey.com , and a few other places.