Even though it was retconned. I still think Sifo Dyas was Palpatine. Sido Dyas. Sidious. Posing as a Jedi. It makes far more sense than what the Clone Wars story came up with. The Jedi never authorized a Clone Army. The Kaminoans never verified the Jedi contacts story. Only waited for someone to eventually show up for their delivery to the Republic.
Jango must know Dooku is Tyrannus but its never specified he does. He could have been lying to OBI-Wan.