J.E. Johnson question

[John Beaman]

Johnson was still flying operations in late 1944 and well into 1945 as both Wing commander and when he eventually was made Group Commander. He mentions in his book that they flew hard, even to the end in May 1945.

His last credited victory was 27-Sep-44, so the question is why did he not have more claims for the next 7 months? Surely he had opportunity as a Wing Commander and could not be doing so much "paperwork" or "commanding" that he did not have the opportunity to fly combat missions? Has there ever been any commentary on this?

Thanks