The rarely, if ever, spoken about thing is expansion. When the Western Bears, or whoever it is, come in the game has to find 30 more players. Just having the Dolphins come in has watered down the talent pool. The teams who can keep their squads together the longest will have an advantage I reckon. To that end Fitzie's strategy is a good one and you only bring in blokes as needed. You also only bring in quality, not players like the current dross available.
Most of the current players are young enough to be retained when current contracts are up. Especially if they keep improving slowly but surely. This will, to a point, ensure the Sharks don't have to go into what will be an inflated market to try and restock the cattle.
We are pretty clearly playing a long game.