Who else would have leaked the information?
A PI would be bound by confidentiality clauses and would have nothing to gain by leaking this sort of information. It sort of takes the 'private' out of being a 'private investigator' if you're running around leaking your activities to the press.
I can't imagine Christine Nixon has any interest in releasing it either.
The lack of a denial by Collingwood on both speaks volumes.
So, in other words, you don't know that it was Collingwood?
The P.I probably didn't leak the info, but it could have been anyone that knew Ben Cousins was being investigated. Associates, Police, whoever.
My point is that no-one knows who leaked the info and unless a statement is made by a Collingwood official, then they didn't leak it.