But we can't know who obito's parents are becouse it's not told in the anime or manga.
It also don't say who are the parents of orochimaru or others...
I think that the forbidden tehniques were made by ninjas like minato (like minato created rasengan and maybe shiki fuujin too), after the creation of them, they knew that they are too powerfull, so they called them ''forbidden''.
Maybe Hiruzen saw the tehnique of minato, not practiced. Maybe minato just told him about it. In a scroll, or somthing, then Hiruzen tryied it out in the with versus orochimaru, and the 2 hokages.
I think that Baki is still in the hidden sand village, or he died in the war or befor, becouse gaara used to be his student, and baki used to be un-fair so maybe gaara now hates him becouse of the fights versus the hidden leaf village.
I think that ibiki will fight if he really needs too. In a great war, or somthing.
Rikudo sennin's grave? Maybe it's hidden from the shinobis, or maybe it dosen't exists, maybe it's a secret place known only by madara.
Sarutobi, Shimura, Senju?
Hiruzen Sarutobi died in the fight with orochimaru.
Shimura Danzo died in the fight with sasuke.
Senju Hashirama died in the fight with madara.
I think that the ''senju'' clan is the leaf villgae, that the villagers are the senju clan.
The sarutobi clan, had only hiruzen and asuma alife, and they died...
Konohamaru is also a sarutobi.
Shimura? I guess it was just danzo from the clan...
thats what i think :D
IIII Mercy? Sofi, please! We're assassins ~ Isaki
IIII They say she's in the class A team III ask.fm showcase Finally, some space in onii-chans signature, I can sign now! Hi Sofi, guess who.<33 :**