the whole point here is that the coaches and staff hudson picked up were potentially out of contract - if they were under contract and they had clauses which allowed NZF to deny them the chance to move (rightly or wrongly) to a competing "business" then Hudson would not have been able to gut NZF.
Putting a clause in Hudson's contract is a little trickier but as was pointed out if NZF were organised they would have contracted those guys they wanted to keep.
Anyway I'm not that worried (admit I don't know how good the video guy was) but let Heraf recruit some continental Europeans (sure he knows a few) that will all row the same direction in terms of philosophy of play etc and rebuild.