Np Bluedevil, nice to see some more Belgians here!
Well yes I was also wondering if that's true (Jan being "friends" with Richthofen, Göring before the war), well it was certainly said during the documentary!
But no doubt Göring and Richthofen already had interest in aviation, otherwise they would not have become fighter pilots in the first place... Probably they met Olieslagers and perhaps they made a nice chat, don't forget that Olieslaegers was, at that time... one of the most popular men in Western Europe! He did meet many, many people, so I believe that he, at least, met and spoke to Richthofen & Göring