Hi Jochen
Personally I don't think neither you nor Shores et al have made a mistake.
You say the photo on page 218 in your II./JG 27 book shows Niederhöfer and so says MAW Vol 1 on page 358. That is also what I am pointing out.
As you can see I don't even think the man in that photo actually looks like Marseille. But I also know how difficult it can be to identify individuals from photos, and I am not any expert in doing so!
Also if you read further up, it is Nick M who believes the photo shows Marseille and not Niederhöfer.
If you and your colleagues are certain that the photo is of Niederhöfer, it works for me (and hopefully for Nick M as well)
Cheers
Stig