I think that is very likely. Even the name, Dread Pirate Roberts, attests to the multiple administrators. The evidence for multiple DPRs is listed at https://freeross.org/proof-of-multiple-dprs/ and is convincing. I'm guessing Ross was a DPR, but not the one who attempted murder-for-hire, if those requests even occurred at all (no one was actually murdered, and two of the investigating agents were corrupt).