Please let's not start it up in this thread. There are enough threads about it already. I'm starting to become nauseous anytime someone mentions Obito, Tobi and Madara in the same sentence.
As it relates to being descended from the Hyuuga clan, Kakashi did say (correct me if I'm wrong) that 'some say' the sharingan descended from the byakuugan. Meaning it's just a speculation.
Anyway I figure that before Konoha was formed, people were just wandering amimlessly setting up shops here and there, until two peeps said 'Hey...let's find a happy place." Thus Konoha (and most likely every where in the world) was formed. Cause humans just want somewhere to call 'home'. ^_^