Number 7 And 8 are not really like facts. But that’s something you should know.
One of the most strongest ninjas in Naruto is Hatake Sakumo, according to Obito, even the legendary sannin are not strong nor worth enough to be compared to him.
After Madara found Obito and revealed who he was, Obito referred to Madara as ‘My Precious forefather’. Which could mean Obito is a direct descendant of Madara.