You're all Wrong. Only Indiana Jones knows where Marion Ravenwood is in Nepal because he visits her there. The Nazi Gestapo agent is on the same plane following Indiana Jones globally to her because they do NOT know at anytime in the story exactly where to find her. Logically, it then follows; If the Nazis could have found her before, they would have already done so and gotten the medallion and would NOT have ever needed to follow Indiana Jones to her in Nepal. Thus, this makes Indiana Jones extremely vital to the whole storyline in Raiders of the Lost Ark.