What we know:
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Sidious and Darth Tyrannus (Dooku) are creating tensions and exploiting old ones to force a war, a war in which Sidious (already Chancellor Palpatine) will become Emporer. The real irony is that a war is pretty much inevitable if the Republic is to stand. Sidious has manipulated events that collapse is unavoidable if war does not “excise the diseased tissue”.
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Jango Fett was located and hired by Tyrannus/Dooku to become a template for the clone army the Republic would use in ground assaults. He also created additional turmoil via the attempted assassinations of Padme, leader of the peace faction.
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The Kaminoans believe they are in the employ of a man named Syfo-Dias. Jedi Master Syfo-Dias was a member of the council, but died ten years ago or so, probably.
Conclusions: it is unlikely that Syfo-Dias is Palpatine/Sidious. While not impossible, there are many easier explanations. Certainly, while I can understand Sidious’ power to be near even the mighty Yoda and go undetected, such powers of spiritual disguise would be much harder with one of Yoda’s close associates.
Also, the ten-year time frame would be cutting it awfully close, as Palpatine had to be elected Senator before TPM, then arrange the events of that, become Chancellor, and then spend a number of years as Chancellor between TPM and AoTC.
In light of another fact, there is something very odd about the conclusion that Sidious = Syfo-Dias. Palpatine was apparently born on Naboo, or at least lived there for time enough to become its Senator. Even for a Sith Lord, this cannot be accomplished overnight. It would have been nigh-impossible for him to be both the up-and-coming Naboo politician and keep up his identity as a Jedi Council member.
Therefore, we can conclude this is an unlikely scenario, and must reject it via Occam’s Razor.
Since it is obvious that Jango Fett knew a great deal about what was going on, (he was in the employ of Dooku and the Seperatists, while trying to assassinate Padme, and being the template for the Republic’s Clone Army.), one must consider his role: he was hired by Tyrannus. This seems very likely, in light of the fact that he fled immediately to Geonosis when faced with discovery by the Jedi.
Also, we must consider that someone deleted Kamino from the Jedi Archive. Such a feat seemingly must have been accomplished by someone inside the Jedi order. However, this person was not skilled in astronavigation or physics, or did not actually care that the Jedi might find Kamino in the proper time, but rather wanted to confuse and harrass them more. Since we know that some Jedi can see the future, it is not impossible that Sidious arranged for Syfo-Dias or Dooku to erase them, though Syfo-Dias’ involvement is doubtful.
In this case, we can derive from these facts that Dooku is the lynchpin of this scheme. Therefore, we are left with two equally likely scenarios:
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Syfo-Dias was asked by Sidious to direct the creation of the Clone Army. He was then killed (or was just old, but some fan-rumors suggest he was murdered). Dooku, upon his seperation from the Order, deleted Kamino.
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After Syfo-Dias’ death, Dooku masqueraded as him for the Kaminoans and acted as Tyrannus to bring Jango Fett on board.
Unfortunately, there is not enough evidence to weight one more heavily than the other, but in light of the lack of knowledge of Syfo-Dias, I suggest the second option would be most likely, as it onvoles the least number of people and runs the lesser risk of detection.