To be fair, that comment "it wasn't all him" is a debatable comment. The gullible fucks who followed his every word religiously deserve their fair share of blame. Even though Hindenburg seemed to have good intentions and intensely disliked Hitler, he did (eventually) help Hitler get in the position to declare himself the Head of State. The political media that led Germans to believe that even in 1918 they were still going to win World War I played a big part in starting World War 2 thanks to that whole "backstab" conspiracy. Frick and Klagges deserve an extraordinary amount of blame for greatly assisting Hitler in becoming a German citizen. After looking on Wikipedia (yeah, not the best source, but this isn't exactly an assignment) it seems Ribbentrop convinced Hitler to invade Poland even though Hitler was hesitant. And Drexler was probably the person most responsible for Hitler becoming Hitler.
Altogether though, I don't think he can argue that it would have happened without Hitler. Perhaps one in a million politicians have been able to captivate an audience a portion of the way Hitler managed to do it. It wasn't exactly something "another person" could just do. Especially since so many people in this world hate and fear public speaking.