Privet Evgeniy
Now you may see by yourself. There are no documents, this causing some claims speculative, but there are documents making them not speculative.
Be careful with those data and take them with a grain of salt.
Regarding combat of 5 September - there is an account of an airman who took part in the battle and who was killed in 1941, so the account could not have been written long after the events. More, in the account the one may find a suggestion, that one of the fallen pilots may have been hit by enemy (it was considered to be more 'honorary' to be killed by enemy and not by an ordinary collision), but otherwise it is extremelly clear that the cause was a collision.
Concerning other possible kills of ZG1, kpt. pil. Leśniewski is one distinctive possibility, shot down by Me 110s on 4 September, some other aircraft being shot up. I have scans of original 1939 documents.
History is not one sided.
I am sending a note to moderators to have a closer look on the thread.