Trading would never work as there are some people here who would trade away their team just to keep someone else from winning......
As Far as the Drafting Goes, We start the draft 4 weeks or so before the current game ends. So take the top 3 in each league at that point and let them stay in their league. That would "most likely" keep the world champion in their current league, then if you are not in the top 3 at that point you go into the draft pool and could stay on your current brand or you could be sent packing. We really can't wait for 1 game to end to start drafting or we will loose a month on each game. If you want to be a champion in a league and repeat come out of the gate strong and lead the game the whole way through.