Velkyn - I can only guess that one of the following is the cause:
A.) The person misunderstands a part or parts of the theory, and has misapplied it.
B.) The person understands the theory but is unable to apply it completely to him/herself.
C.) The theory is fundamentally wrong and the person shouldn't bother more with it.
I'm not familiar with the names you mentioned. I'm VERY new to Mouravieff and have only just begun to be exposed to him. I assume you're comparing him to those other people. I will check them out.
I guess if it is not to your liking, or if you feel that his theories are incorrect then maybe you've found something else to be true for you. For myself, it is a beginning of a new direction.