my theory
I think that master syfa-dias was in fact a jedi all along and was probably tricked or forced into ordering the clones by dooku ten years ago. He was probably told that a jedi would be used as the basis for the clones and that is why he agreed to do it but was killed by dooku before he could select a subject. At that point, dooku chose jango fett to be the subject at the request of sidious.
This would explain the the look on windu and yoda when obiwan mentions syfa-dias. They maybe know there was a duel between dooku and dias and that dooku won it. Maybe they have always wondered why they fought each other and the answer has become clear to them. This would also explain why dooku has been banished form the jedi order and is on geonosis. (He has been banished because he killed another jedi).
Sidious has been keeping tabs on the clones during the ten years through jango fett and then dooku but his plan goes tits up when the jedi discover the clones and yoda uses them for the good guys.
What do you guys think???