I have never been able to understand why Anakin would turn so against Obi-Wan. Resent him, yes. Hate him to the point he does, no. Spoilers suggest when Anakin awakes as Vader, he asks "Where is Padme" and Palpidious replies, "You killed her". That doesn't sound like a Lord of the Sith to me. Maybe Palpidious tells him, "Obi-Wan accidently killed her trying to get to you."
Just a guess for fun.