Hello,
I believe the date of Lothar's description of the red Albs and their individual colors has to reference between 21 April--the arrival (according to Ferko) of Allmenröder's 629/17--and 13 May, when
LvR was wounded and out of action until late September, by which time Schaefer, Wolff and Allmenröder were dead.
To be clear, I'm not suggesting that after 13 May J11 didn't fly red planes--of course, they did--just that LvR wasn't around after that date and so his description of when the
Staffel transitioned to red with individual colors must have occured before then.