[JohnnyB]

Up to the end of 1943 JG26 Gruppen flew with 3 Staffeln, then following a 4th Staffel. I would say that Sean´s question (7.Staffel, Battle of Britain Aug.1940-May1941) means Gruppenkommandeur III.Gruppe

For example so as in october 1943 :

Gruppenkommandeure :
I. Gruppe
Major Borris

II. Gruppe
Oblt. Seifert

III. Gruppe
Major Mietusch

So Sean don´t asking for Staffelkapitän.