[John Beaman]

Miguel:

I agree with you. It is likely one of those photos where everyone stood in front of the same aircraft and had their photos made. A keepsake/send to the family shot.
It would be interesting to know when the photo was taken and when Knoke was made StaffelF., flying sw. 1. The "gunboats" under the wings indicate a later date, so several a/c had them. Knoke mentions having the "directional" device--aka Morane mast, but I forget the date.
Knoke was not much taller than 5'-2/3". Also, the guy in the photo has a much longer face, nose, etc. He is definitely taller. See Knoke's photo with 'his 5th" and he is, by far, the shortest.