Thanks again Matti
Johann 'Hans' Mader was Kommandeur of II./KG 6 at this point.
In the main text Jan Horn makes it clear he was flying an aircraft if I./KG 6 during the night he was lost. Hans seems to have been his nickname al through his career (see Ritterkreuzträger der Kampflieger)
Looking in Zeng/Stankey's Bomber Units book they put forth he was temporarily acting as Kommandeur of that unit as well which means that Mader in practice was in command of both I. and II./KG 6 at the same time.
I didn't realise this until now since neither authors seems to 100% realise this either in their books. My apologies Matti, I should have looked closer the first time, but my aviation interests and other commitments makes time rather precious....
So we have an aircraft lost from I./KG 6 and a commander from both I. and II./KG 6. Horn followed Mader's main posting (II./KG 6), hence his reporting of the loss the way he did.
Cheers
Stig