How much difference a year makes... a year ago I was sure they'd be keeping Za'Darius and getting rid of Preston.
But Packers don't trust lineman with back injuries (and edge rushers are lineman even if you call them OLB), back injury and Packers want to get far away from Za'Darius.
Also, in this defensive scheme, normally they look more for long versatile edge rushers, more like Preston. So he fits the scheme well also, and he's got a big contract, but it's not elite huge contract which Packers need to stop over paying everyone and it was nice to be able to keep Preston and Campbell on large but not elite contracts.