In this instance we know who Party B is but not Party A.
Under most contractual arrangements title of "goods" does not transfer until the appropriate quantum of coin of the realm has been handed over. It can become a bit messy if Party B is subletting to Party C if such subletting is not allowed under the contract. It is normal in most contractual arrangements to have a clause which precludes subletting without prior permission of Party A.
Point 5 was slightly but only slightly tongue in cheek. I am sure you follow the drift.
Not much has been made public about the legal gripes, aside from the fact that Halligen seemingly swanned off with the cash, and didn't pay his disgruntled employees / sub-contractors.
Could some parts of the dossier have been withheld pending sub-contractors getting paid? I find that possible. What, if any, sub-contracting contract actually say? Was it even officially a sub-contract?
A bit of a mess, methinks.