I am a little late to this, but find it an interesting question.
I too am studying the WNW MVR Albatros D.V kit right now in anticipation of an upcoming build.
I think it's quite possible those fuselage cross borders have been overpainted in something that matches the look of the varnished plywood fuselage, so as to make the borders go away. Why that would be done, I don't know. Could they have been overpainted in a tinted varnish or wood stain type of product to try and match the fuselage more closely?!
I have also been studying the all red D.V in the WNW kit, and I notice they suggest completely eliminating the fuselage crosses from the aircraft. *Yet* they are clearly visible in the photograph, albeit heavily overpainted. They are still there though and you can faintly see them.
I also find it strange that WNW seems to think the wing crosses on the all red aircraft are clearly not overpainted, but the wing cross white borders are. Again, evidence of Jasta 11 or MVR playing around with overpainting cross borders! Why?
These old B/W photos are so poor, I do think there is some leeway here to make these planes as the builder sees fit, within some reason of course.