I was reading another thread under People discussing photos of April 21, 1918...Rod Filan quotes a letter written by
Wolfram von Richthofen who writes that Krefft died after the war. The letter was found on the derrittmeister militaria web site.
Maybe this might be of help. I also have many questions about what happened to individuals associated with MvR after the war.
Best Regards...FliegerJG1