Didn't Madara create the tablet or the Elder son. I forget and I also don't remember Tobi saying that. I think you mean Creation of all things. What I'm saying is if Uchihas were using Senju Dna to make themselves stronger there were other benefits besides Izanagi to put them over Senjus. It just wouldn't make any sense. At the same time if we had Uchihas w.Senju dna back then wouldn't we see vice versa?
nope tobi said about s06p that's how i remeber it
and probaly stone tablet was created by elder son most probably ............ leave it there
think about izanami and izanagi and it's use
why would izanami would be created by uchiha to stop an fellow uchiha
if you think uchiha can use it without senju dna, also if they don't lose the eyesite wouldn't they (uchiha clan) be invincible
i mean if you have izanagi users in your army throw them in to the battle and you'll never get bad result cuz the user being immune to death
fact that izanami was created by the uchiha themselves to stop another uchiha suggests that they were dangerous to their own clan. (may be stealing eye).
see the first user so6p was creater of izanagi(he already had both yin & yang)
but izanami was created latter to stop the izanagi users by the uchiha.
further i don't see that why senju dna is unimportant for the izanagi cuz you are playing with death itself.
you need both yin and yang
nagato had rinnegan he could fake the death of others
i see izanagi as a small version of that casting on oneself to avoid death, if uchiha don't need senju dna they will simply be to hax and above senju.