Common sense would say that Manly already had Tony Willaims off the bench with Stewart, Watmough and Galavaou or Rodney in the pack.
Kite, King, Rose plus blokes like Burher, Robinson, Mauro, Lussick coming through. Safe to say they figured their already stretched to the limit cap would be better off losing a few and extending blokes like T-Rex, Burher etc like they have.
That being said most clubs would have some room to move, Manly aren't most clubs. Further more Mason would surely force his way into any bench at worst, however would you want to possible lose Tony Williams or Burher or Lussick for a year or 2 out of Mason.
No way.
As I said anyway, despite Des being a fan, the board isn't and won't allow it from what i've heard.