No Anakin is the most important character because the whole story is about him. The rest of the characters are all effected by him.
Qui-Gon helps get him freed.
Obi-Wan trains him.
Padme falls in love with him.
Palpatine turns him to the Dark Side.
Obi-Wan trains Luke to turn ANAKIN back.
Yoda trains Luke to turn ANAKIN back.
Luke brings him back.
Everyone is effected by what Anakin does. You could completley change Qui-Gon, Obi-Wan, Padme, Yoda and Luke to different charcters and the story still works. You couldn't take Anakin out though because he is the story.
Yerssot any ideas on how Obi-Wan ends up fighting for Bail Organa? Does Alderaan get invaded?