I'll go a step further, Anarax. While this can be useful information, I'm not sure how important it is. I'll use my primary art as an example. Because I know NGA has roots in Daito-ryu, most likely taught by Kitaro Yoshida, I know it has near-direct links to Ueshiba's Aikido, more direct links to all the current lines of Daito-ryu, and some pretty thin indirect links (through Kitaro) to Yanagi-ryu. That's useful information, but I'm not sure it's that important. I've talked with students who, though they had to know that at some point to pass their yellow belt (first colored belt) test in the NGAA, have long since forgotten it or confused it. Why? Because it doesn't really matter to their training. It matters for those of us investigating to look for where principles came from (usually, because we either don't really "get" a technique, or because we're looking for a better way than what we know), but to the average student, it's just trivia. A clear case is the fact that we are almost sure Kitaro is the source of the Daito-ryu base of NGA, but we can't be sure. A knowledgeable instructor in another art tried to help us with researching that, but the Daito-ryu records are somewhat fragmented and might not even be complete at this point. His final response to us was (paraphrased), "I wouldn't worry about it. It doesn't really matter whether Morita trained under Kitaro, or he invented NGA entirely on his own from a bunch of made-up techniques. It's the effectiveness of the art that matters. Go train."
This is why it bugs me when I see so much emphasis on lineage. It doesn't seem important enough to really deserve the air time it gets. My "lineage" in NGA is interesting, but I've only ever used it to help folks understand what to expect (some known differences between the two men who were once the ranking active NGAA instructors). If someone were to claim to have learned their NGA from Bryce Lee (who left the NGAA and probably stopped calling it NGA some 20+ years ago), that wouldn't really tell me anything useful.