Found this on a site, in the AOTC section - Might be true might not be true, i just thought i'd bring it to your attention:
In the finished film, there are various mentions of a Jedi named SIFO-DYAS. However, in the earlier drafts of the film, the name of the Jedi was SIDO-DYAS. The details surrounding this elusive Jedi are sketchy and have changed quite a bit from development to the screen. In the beginning, Sido-Dyas was labeled an imposter and the Jedi seem to have no knowledge of him. However, in the finished film, Sifo-Dyas was a Jedi who was killed almost ten years before the events of EPISODE II. For whatever reason, the circumstances surrounding the mystery of Sifo/Sido-Dyas were rearranged.
There are too many mentions of both Sido and Sifo-Dyas in the different versions of the screenplay so I won't quote every excerpt in here. I'll try to explain them all as easily as possible.
Note: Items from The Art Of Attack of the Clones version are denoted with (*), items from the 2nd draft are denoted with (**) and items common to both versions are denoted with (***). Keep in mind that in the 2nd draft, the name Sido-Dyas is used and in the Art Of draft, the name Sifo-Dyas is used. For common items, I won't list anything twice - you'll have to make the name switch yourself. I'll use Sifo-Dyas as the default name.
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Excerpts: From The Art of Attack of the Clones (*) and an alleged early draft(**). Items common to both screenplays are denoted with (***):
The first mention of Sifo/Sido-Dyas occurs in the same place in both screenplay versions, when Obi-Wan first meets Lama Su.
*** LAMA SU
Please tell your Master Sido-Dyas that
we have every confidence his order will
be met on time and in full.
He is well, I hope.
Another mention of Sifo/Sido-Dyas occurs when Obi-Wan is asking about who the host of the clone army is. The only difference in the versions is Lama Su's partial line at the end, denoted by the (**).
*** OBI-WAN
Who was the original host?
*** LAMA SU
A bounty hunter called Jango Fett.
We felt a Jedi would be the perfect choice,
but Sido-Dyas hand-picked Jango Fett
himself.
*** OBI-WAN
Where is this bounty hunter now?
*** LAMA SU
Oh, we keep him here.
[** After a few hundred thousand clones,
the genetic pattern starts to fade,
so we take a fresh supply.
He lives here, but he's free to come
and go as he pleases.]
Another mention of Sifo/Sido-Dyas occurs during the Tipoca City tour when Obi-Wan asks about accelerated growth. Obi-Wan's last question is the only difference here.
*** OBI-WAN
You mentioned growth acceleration...
*** LAMA SU
Oh yes, it's essential. Otherwise, a mature clone
would take a lifetime to grow. Now, we can
do it in half the time. Those items you saw on the
parade ground were started ten years ago,
when Sifo-Dyas first placed the order,
and they're already mature.
** OBI-WAN looks at the BOY CLONE
** OBI-WAN
And these?
** LAMA SU
About five years ago.
Yet another mention of Sifo/Sido-Dyas occurs during the Tipoca City tour when Obi-Wan is inspecting the embryo hatchery. Some of these lines were later moved up to the scene where Lama Su first meets Obi-Wan.
** OBI-WAN
(carefully) Tell me, Prime Minister, when my
Master Sido-Dyas first contacted you,
did he say the order was for… himself…or…?
** LAMA SU
Himself? Of course not.
This army is for the Republic!
** OBI-WAN
(astonished) The Republic?
** LAMA SU
We are also very much against this Count
Dooku and his secessionist movement.
We are proud to be of help to the Republic.
As discussed earlier, when Obi-Wan contacts Mace Windu and Yoda to tell him of what he's learned on Kamino, there's a mention of Sido/Sifo-Dyas again.
** 71 INT JEDI TEMPLE, MACE WINDU´S QUARTERS - EARLY EVENING
Yoda and Mace Windu listen as a hologram of Obi-Wan stands between them broadcasting the message. The signal is very weak, the image fades in and out.
** OBI-WAN (V.O.)
I've never heard of a Jedi called
Sido-Dyas, have you, Master?
** MACE WINDU
No. Whoever placed that order was
not a Jedi, I can assure you.
** OBI-WAN (V.O.)
I have a strong feeling that this bounty hunter
is the assassin we're looking for.
** YODA
Who he is working for…
discover that, you must.
** OBI-WAN (V.O.)
I will, Master, and I will also find out more
about this clone army… May The Force…
** The hologram switches off, and OBI-WAN fades away.
** MACE WINDU
A clone army! Ordered by someone in the
Senate perhaps… Someone's out to start a way.
** YODA
Inform the Chancellor of this,
we must.
** MACE WINDU
Who do you think this impostor,
Sido-Dyas, could be?
Sido/Sifo-Dyas comes up again in the conversation in Jango Fett's apartment. Taun We is the main culprit this time. Most of the lines here in all the versions are the same except it appears Taun We's line was removed. Obi-Wan asks Jango if he knows of a Sido/Sifo-Dyas and the dialogue from the finished film ensues, except as I've said, Taun We's line and also Jango's mention of DARTH Tyranus (as opposed to just Tyranus in the film.)
*** OBI-WAN
Sifo-Dyas. Isn't he the Jedi who
hired you for this job?
*** JANGO FETT
Never heard of him. I was recruited by a man called
[** Darth] Tyranus on one of the moons of Bogden.
*** OBI-WAN
No? I thought…
*** TAUN WE
Sifo-Dyas told us to expect him. And he showed
up just when your Jedi Master said he would.
We have kept the Jedi's involvement a secret until
your arrival, just as your Master requested.
*** OBI-WAN
Curious…