No, I get your point.
However you are mistaken. A WCO does not have the right to enter private property to settle a dispute over ownership of a animal, or recover the animal for you, without the landowners permission.
The thing about it, is the recovery of a animal is a property dispute. It isnt yours until you tag it, and you cant tag it without breaking the law.
You want a WCO to act as your agent and remove a untagged deer from someone elses property.
I think that you are putting the WCO in a bad situation.
First, he has only your word that you shot the animal.
Second, it is a game law violation to move a untagged deer.
Third, it is trespassing to enter someones property without permission. Even with a badge, a WCO needs a legal reason, he doesnt have a open ended authority. He would be in violation of the law to enter the property to retrieve your deer.
The neighbor is a tool, but he is correct.