The end result is the same isn't? Terminate the contract, ask for, and be granted a release, he still walks out on Manly, his club.
Somehow, I think DCE is the last person Manly would want to see walk out on them, and I doubt they would just say, "Sure Daley, we'd love for you to play for the Broncos. Enjoy".
Oh, and how would we feel if Parker or Hodges or Gillett, Oates or McGuire walked out on the Broncos?
There is at least some honour and integrity behind Barba's and Milford's reasons for leaving (if Milford leaves, to which my instincts say he won't).