Anakin Skywalker was mutilated and defeated by Count Dooku in Star Wars: Episode II – Attack of the Clones, but what if the Sith Lord also killed his mentor, Obi-Wan Kenobi? Anakin Skywalker would be left without his closest friend as the galaxy went to war and he became a mentor to Ahsoka Tano, resulting in a different iteration of Star Wars: The Clone Wars and, subsequently, the Star Wars original trilogy era. Anakin would have a much darker storyline and fall to the dark side more easily, but even in this grimmer version of the Star Wars saga, the Jedi would prevail.
Anakin was faced with a similar scenario to this in the Legends continuity. In the original Clone Wars multimedia project, Obi-Wan Kenobi and the ARC Trooper Alpha were presumed dead during the disastrous Battle of Jabiim. Anakin, who became a Jedi Knight much later in the Clone Wars in Legends than he did in canon, was assigned to Jedi Master Ki-Adi-Mundi, who challenged Anakin’s views on attachment by divulging the tragic loss of his (Jedi Order-approved) family at the hands of the CIS. Whatever lessons Anakin might have learned from Mundi were lost when Obi-Wan and Alpha resurfaced, having been POWs on Asajj Ventress’ home planet of Rattatak.
Related: Star Wars: What If The Separatists Had Won The Clone Wars?
If Anakin lost Obi-Wan in Attack of the Clones in the Legends timeline, he’d likely be assigned to Ki-Adi-Mundi for the entirety of the Clone Wars, but without Obi-Wan’s good influence on him, he’d likely fall to the dark side and betray the Jedi Order to the Sith sooner, resulting in a far gloomier original trilogy era, since Obi-Wan wouldn’t be alive to train Luke Skywalker as a Jedi. In the canon timeline, the Clone Wars were quite different
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