Steve
Mostly Harmless
Expertise is relative.Steve credibility comes from the value and integrity of your posts, not necessarily from expertise. For example there are several obviously young posters on MT with limited MA experience making great contributions to the forum. Sometimes they might get it a bit wrong, someone points out what that is, they take that on board and have benefitted from the experience.
As to whether Hanzou has expertise or not, I really don't know and I don't really care. What he says that seems to be credible loses credibility when he turns on some other style or person. That makes me ask, does he really know what he is talking about or is he just taking another cheap shot? I am not in any position to question his opinion on BJJ and I haven't. That is for others with more knowledge than me.
Is a BJJ purple belt an expert? Who knows? He might be a competent grappler but that doesn't mean a lot when it comes to expert opinion. Is a person with the same time in training in another style an expert? Obviously not if what has been posted is to be believed.
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