I've met Del a few times, most recently last year at a small bar when he came to watch a mate's band play (My mate is a great friend of his). He is the tour manager and handles all the logistical stuff of which there are numerous things that all must go well for a tour to be successful. Del seems to be a genuine and nice guy. Zero ego.
There would be other managers too, financial managers, marketing managers perhaps, and each of Axl (Guns N' Roses), Duff and Slash have their own individual management. Fernando was the General Manager of Gn'R, so depending on the Business model/structure of Gn'R, he probably has a lot of power and sits above most. I always thought it was a strange appointment though, to appoint a nobody as the GM of one of the biggest bands of all time. Obviously Beta had a bit to do with that. Axl seemed to be passive about it when he talked briefly about it on that tv interview years ago.