Mace Windu enters the Geonosis arena in Episode II: Attack of the Clones, sneaking up on Dooku, Jango Fett, Poggle the Lesser and Nute Gunray. Windu puts his purple lightsaber to Jango Fett as Dooku turns around and says, “Master Windu, how pleasant of you to join us.”
To which Mace declares, “this party’s over.” Jedi can be seen emerging throughout the arena, soon the Geonosians fly away. “Brave, but foolish. You’re impossibly outnumbered”, Dooku insists.
“I don’t think so,” Windu says.
“We’ll see”, Dooku states. Super battle droids enter through the hallway and fire upon Windu, who is able to deflect the bolts as Fett tries to engulf the Jedi in flames. The Jedi is too good to fall for that and jumps into the arena as he still deflects the fire and bolts. The battle begins as the Jedi and droids engage and become badly outnumbered until Master Yoda arrives with the cavalry of clone troopers.
What if Windu had put his saber to Dooku instead of Jango Fett and with no hesitation killed Dooku?
What if Dooku died at the Geonosis arena?
Windu would have had to be really quick to kill Dooku in the presence of Fett and the Super battle droids emerging through the hallway. That being said, Jango Fett likely would have had a small window of opportunity to kill Windu, lasting a second or two after Dooku was slain. Fett likely would kill Windu and if not, the battle droids would finish Mace off after Jango fired upon the Jedi Master.
With Dooku dead and very likely Windu dead, much of the same would have occurred. The Jedi would still be outnumbered by battle droids and would have to fight at a disadvantage until Yoda arrived. Jango Fett would face the Jedi and at some point find himself facing Kenobi or Skywalker. Kenobi would attempt to take Jango in as a prisoner; Skywalker would go for the kill. If Anakin and Obi-wan faced Jango together they could neutralize him, with Anakin possibly giving in to his hatred.
Fett might choose flight over fight if he felt outnumbered by the pair and escape to fight another day. Wouldn’t that be something?
The Jedi would take Geonosis upon the arrival of Yoda and the clones. Gunray would run off to tell Sidious of Dooku’s death, and the other separatists would attempt to leave. The Jedi and clones would have to apprehend the separatists before they enter space. In space, the Republic cruisers would attempt to use a tractor beam on any escaping separatists.
Sidious would feel unsure. His war would have been started. Many Jedi had been killed. As now had Dooku. Darth Sidious would likely use Grievous in place of Dooku, not as an apprentice but as a commander and face of the Separatists. Sidious would possibly look to Asajj Ventress as a placeholder until Anakin arrived. Maul might even be considered. The war would go on until Anakin could be turned to the Dark Side and the Jedi decimated.
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