Doesn't anybody think it is strange that whilst Madara, founder of the Uchiha clan and a founder of Konoha, is killed by the First yet the Uchiha clan still survives?

I think there is something like the Hyuuga clan family system running in the Uchiha also, except that with the Uchiha the difference between the two branches is political rather than a master to slave realtionship that exists in the Hyuuga. I think that when the First defeated Madara, one family of the Uchiha clan didn't support Madara and stood by as he was defeated. Either that, or the entire Uchiha family just stood by and watched him lose. I think that is probably what drove him to wipe out his entire clan, whilst keeping the best sons in the form of Itachi and Sasuke for himself.

I think it is pretty clear that it was Madara who summoned Kyuubi to attack Konoha as well. What is interesting though is that if this is the case, both Kyuubi and Madara were unable to defeat Yondaime. What I want to know is though what has Madara been doing all this time? Has he been regenerating? Is that why he wears a mask, because has not fully regenerated yet? Also, is the final secret of the Sharingan something that surpasses the Rinengan that Jiraiya didn't know about? Does Itachi know Madara = Tobi?