Well since Ahsoka left the Jedi shortly before the events in Revenge of the Sith, it's possible.
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He didn't have one. Luke has an apprentice during The Clone Wars: Asoka Tano
asoka
Dave Filoni; the director on Star Wars the Clone Wars
Nose, but yes she does
No, the first time we see Ahsoka is in the Clone Wars novels, then in the film. The novel came out a few days before the film did.