Robert, I'm going to send you a PM about Saito, as this site does not endorse or engage in fraudbusting. I just need to clear some room first, so give me a bit.
But, to answer your question as to how your history can be "out of date", new facts can come to light which expose certain claims as incorrect. Putting it incredibly gently, this is a case like that. The other way it can be out of date is that incorrect ideas (such as your idea that Tanemura was a student of Takamatsu's before Hatsumi was as you didn't realise that Hatsumi was refering to Ueno Takashi, who taught him Asayama Ichiden Ryu and Bokuden Ryu, as well as a line of Shinden Fudo Ryu and so on) are accepted, and then corrected when better information comes to light.
EDIT: Just starting to write out your PM, and something struck me. As Dean said, there is a lot that is incorrect in your post, and the very Ryu you are refering to is one. Fujita Seiko was the last head of the Wada-ha Koga Ryu, nothing to do with the (or any) Iga Ryu. Okuse Heishichiro was the former mayor of Iga-Ueno, no connection to the Koga Ryu or Iga Ryu (other than the museum there featuring both Iga and Koga exhibits), and Saito Kazuo claimed to be the head of the Iga Ryu (more on that in the PM). So the Ryu themselves don't even match up in your version, which should be the first clue.