Regarding the caricature, it seems like it was one of fifteen (all different people), see this article published in the Hohenzollern Yearbook 1901, particularly page four, which has Fritz in the middle, Ferdinand to his lower right (standing on his toes, ha), and apparently George Keith in the upper right corner (I really like this one). Don't know any of the others (see pages 3 and 7 for the names).