These documentry programmes are, regretably, the product of either inquisitive minds or those who 'think' they know. The real fact is that no-one will ever know. Taking the credit for killing a great pilot in the new arena of air warfare was, I imagine, quite a coup - if you could prove it. Which no-one ever has.
All that aside, von Richtofen was a brilliant pilot, a first class shot, and could handle the temperamental DR1 better than anyone, using it as a well aimed gun in any position or manouvre - a very difficult thing to do. The law of averages seems to be the winner.
A very Happy New Year to all.