The council is just a figment of your imagination, its existence is merely a myth.
On a more serious note, I think mentors should simply be anyone who wants to help out others. In some cases they can give direct knowledge, in other cases, simply point new/other coaches towards the right information. Even with the new engine upcoming, there are still many things that will remain the same....recruiting being the first that comes to mind. How and who to schedule, what is vision, blah, blah, blah...