Signing bonus money accellerates to the year you cut them. It can no longer be spread over the life of the contract once you terminate the contract.

Cutting Will Smith only saves 7 million, not 14.
Cutting Vilma only saves 6 million, not 8.6.
Cutting Harper only saves 4 million, not 7.
Cutting Hartley only saves 1.1 million, not 2.6

And then you have to add the cost to replace those players.