Good thing you got to it first. I had to re-read that post a couple times.
As to Revan mastering any Lightsaber forms. Because there is absolutely no evidence to support such a claim, we can only assume that he did not. We know that we was skilled with a lightsaber, but we can't say that he mastered any of the forms.
See, here is my problem. Why can we only assume he didn't master a lightsaber form? We have no information on this either way. Given his skill as a duelist, it is perfectly legitimate to assume he did. Either assumption is completely valid.