We'll never know who he preferred when he asked one player to waive his NMC to complete a trade for another player? That's an interesting take. Had Marner agreed to waive, do you think Treliving would have said just kidding? No chance....that's not how you treat star players and agents of star players in the league. He only takes that to Marner if he's ready to make the deal, IMO.
I am only talking about the moment in time where Treliving decides to go to Marner and ask him to waive. To me, it's very clear what his preference is there. He very well may have had different preferences at differen points in time (e.g. when he offered the picks + prospects package, or when he did media.)