Hello,
Thank you for your reply. Interestingly enough, I found the photo of Oblt. Rolf Sclegel on page No.18 in the above book, although the index at the end of it made reference to him as Hans Schlegel. I also found no evidence of him in Henry L. deZeng IV and Douglas G. Stankey excellent reference work here
http://ww2.dk/Lw%20Offz%20-%20S-Z%20-%20Apr%202014.pdf
Nevertheless, I was primarily interested in the actual Staffel designation, and any additional information in the respect of personnel is a welcome bonus.