My Episode III prophecy....

it's stated in the novel that he left because of the death of qgj, so I heared

I think that is most definitely the default thing to think. The idea that Dooku could have taught Maul would appear ridiculous; as indeed it is.

what are you babling about USH, I want to know where it is stated that Dooku left AFTER Maul was killed.
And Yers the novel just say he left cause he lost faith in the Republic

I'm not babbling, I was answering your question. It's not stated directly but it is the default thing to think that Dooku left after Maul died.

Incidentally, here is a script extract from the unused 'Lost Twenty' scene from AOTC which clearly shows what time period they were thinking about with Dooku.

"He disappeared for nine or ten years, then he just showed up recently as the head of the separatist movement."

That line may not have made it to the film but we have plenty that shows that when DOoku was created he was clearly intended to be a person who left the Order AFTER the battle of Naboo.

The idea that Dooku could have taught Maul would appear ridiculous; as indeed it is.

I was pointing out why, as far as the Jedi are concerned, he could not be the Master, having already established that thinking he was the apprentice almost certainly did not occur to them.

seems like nothing occur to the JC, they come out as a bunch of morons unable to spot a thing.
After the battle of Naboo they must be on the alert of another sith (other than Maul) knowing they(siths) have returned. If the master was left he would certainly seek a new apprentice, and if the apprentice was left he would advance the rank to a master seeking his own apprentice. But to me it seems by the time of AOTC they havent bothered too much looking for the siths even if they complain about the dark side clouding everything.
In the eyes of the Jedi council, knowing the Siths are out there, Dooku must be a highly candidate as a suspect of being a Sith after the insidents and encounters of AOTC.

Originally posted by Ushgarak
"He disappeared for nine or ten years, then he just showed up recently as the head of the separatist movement."

9-10 can be 10 as much as nine and if 10 well then it can be before the battle of Naboo

Republic failed, that was clear AFTER the battle

Originally posted by Ushgarak
I'm not babbling, I was answering your question. It's not stated directly but it is the default thing to think that Dooku left after Maul died.

did Dooku got hit by Yoda's lightsabre? Did Dooku got into problems during the fight?

well this info we know.
The first clones was ordered by this Sifo-Dyas dude around 10 years ago, Jango was recruited as template to the clone army by a man called Tyranus, so from this WE know Dooku must have been recruited as a sith very much right after his departure from Jedi order.
It is also a fact that the jedis dont know he is a sith by the end of AOTC, but he must be a prime candidate of being one. Knowing there is one sith around after the battle of Naboo, it must dawn on the JC that Dooku may as well have gotten seduced by the surviving sith. After all they know he has joined the dark side, being corrupted by the dark side a seduction towards a sith cant be far away.

even if you aint got hit, you can be outclassed. To me it seemed he was busy defending himself. An even match but with a little edge to Yoda

they won't admit that easily, he was one of them.
They think he can't do any evil things
"He's a political idealist, not a murderer"

well all that change after the encounter

the only thing it tells them is that he is now with the Dark Side, not that he is a sith!

but the chance of being on the dark side and move/ceduced towards being a sith must be close. Especially when the surviving sith must be looking for a new "partner"

not at all, dark side doesn't mean sith by default