Thanks, Chris! That's exactly what I was hoping for....some specifics.
L/15 was most assuredly Schickle. Some are convinced it made its own RK (as shown in its catalog, not mentioned by Geissler). Others are not so sure. There is a Schickle RK, with a set of supposedly Deumer made Oakleaves, on a "Deumer" card in the Shropshire Light Infantry Museum in the UK (as previously shown by Gordon Williamson). Also a Schickle RK with an unmarked set of Godet Oakleaves (something never previously seen, but now confirmed to be authentic) was recently offered for sale as being something brought back from Ludenscheid at the end of the war by an RAF sergeant. To confound matters, the RK in the "Stadtarchiv Lüdenscheid", attributed there in Deumer's home town as being a Deumer product, is a Zimmermann. There are photos, also from the Stadtarchiv, showing Deumer workers finishing RK's, but they are unfortunately unuseable to determine what type.
The Brillanten on page 547 (I assume you mean the set in the upper left of the page) is something I also find exceedingly strange.
I would assume there are other controversial things in this book, but this is a good start!