Yep exactly. The dead money is already money in the players pocket. Now Bush didn't get big un guranteed base salary in 2015-2016 but not many players got all the un-guaranteed money. It's just how the NFL work.
The NFL is all about getting paid big once really. Suh did this in 2010.
The 9.7 dead for Suh is already in his pocket. Same with Chris Houston.
The agreement was play for the lions for 5 years and they will give him 65 million. 13 million a year for him is/was a fair amount. He played very well for those five years.
Dead money is because the Lions wanted to spend more money in 2013 on other players so they put it out to a year that never really was a real part of the contract.
Suh fulfilled his part of the contract, he played for Detroit hard for 5 years. His prior contract should make no difference on his next one.