Just because Pain was taking orders from Tobi, does not mean he was weaker. He merely believed in Tobi's ideology.
I don't think his Genjutsu is lethal, dude... And I know exactly which part you're talking about...
And regarding Izanagi... That isn't what Izanagi does... You're overestimating him.
His genjustu killed her...
Do you even know how inzanagi works?
We're referring to complete perfect Inzanagi, Danzo's was incomplete inzanagi.
All he can do is respawn...
Also, Tobi still destroys him, the ones I just listed were just half his power.