Once more, Jackson's "price" isn't high, the only "price" that matters is what is included in the Cap.
It's important to always keep in mind that the average for a player in the 30 is $9.5m / 30 = ~$317k
The only thing that farkin matters is how much is in the Cap, what is not in the Cap is totally irrelevant. For a start we would loose the $200k veteran player allowance (unless we want to give to to Hopoate, who I think is our only other qualifier) and the player that replaces Jackson at Captain could easily ask for up to $100k increase for taking on the responsibility. In typical journalist fashion you can bet the sometimes reported $700k includes things that aren't in the Cap, a car for a start and if I remember rightly Jackson is also on an education allowance. So moving Jackson on may well really only save ~$350k in the Cap.
In Cap terms Jackson is only just above the average for the top 30 player and obviously below the average for top 17 player.