Torah is immense. Mesorah and halachah combine for a fraction of a fraction of The Entirety of Torah. And most of it is in regards to praxis, anyway. And to read your whole post, it makes no sense. If Judaism is based on mesorah and that only is existent from our rabbis giving it over, then how could it be that each Jewish Community has a different mesorah, but the same Judaism?
PS I’m not really disagreeing, as much as trying to separate the different topics.