.why did Hitler respect Pilsudski so much? ..
You need to ask him. I guess, because he was an autocrat, the victorious leader of the war with Soviet Russia. Maybe their personalities - narcissistic mitoman kind - somehow clicked.
He was a Pole..
I think he would correct you there - he was Lithuanian from the old Republic, not the new chauvinistic tribal breed.
I would say his sentiments allowed the Lithuanian Republic to exist after 1920.
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Also, I must say that Hitler was the first German leader to attempt to normalize relations with Poland after World War I. He even saw Poland as a potential ally.
I think his later beef with Poles and Poland psychologically stemmed from his perception that Poles were leading him on and then turned against him. When in fact they were just detached from reality.