My imagination is absolutely fine. That doesn't mean I will accept any old crackpot idea like this one. I'm sorry you are upset I don;t like yor idea but that is because it is anot a very good one. I see absolutely no good evidence to support it and a ton of stuff that contradicts it.
Obi-Wan does NOT give a look which contradicts Sifo-Dyas not being a Council Member, and I am sure he would have said if he was not. His look was that the Kaminoans did not know he was dead.
Maul could not have been a Jedi because it would have been impossible to keep that covered up. Qui-Gon speficially says that he could only conclude that the person he fought was a Sith. This is something he would only say if the possibility that it was a Jedi had been COMPLETELY ruled out. Besides which there is absolutely no credible reason whatsoever for this to have been covered up. NONE. Nothing, from the Council's point of view, was even happening at this time.
Meanwhile, the fact that Tyrannus sent Jango clearly places the continuity of these events after Maul's death. He could not have placed the order.
Your idea involves the whole Jedi Council being in on a conspiracy to cover up who Maul was, it involves Maul placing an order for something after he died, for an army which GL's interview makes clear was only required AFTER the shortcomings of the droids were show up (this, by the way, completely destroys your idea). It involves Sifo-Dyas having never been seen by anyone in the Jedi Order ourside of the Council who are then further embroiled in this unusual conspiracy of silence.
let us be clear. It is only Windu and Yoda that are keeping anything back, and this is specifically about Sifo-Dyas who is xlearly a plot point for the current story, not anything to do with Darth Maul who was just a thug introsuced as a bad guy for TPM and for whok there is no more to whatsoever.
Now, if you are not prepared to have your ideas criticised then perhaps you should not post them. As it is, don't get so shirty about having such a ill-thought out idea roundly contradicted.