Why not have the guy sit in the yard, somewhere neutral. Killer offleash, let him greet the guy normally. Let them just hang out. Don't force the dog to approach, but encourage it. Give the guy treats to hand out. No eye contact with the dog. Just be cool.
If Killer has dominance issues, that could be a different problem. If he's reacting the guy's fear, then this is fixable somewhat. Why is he greeting the guy by jumping on him? Does he have no "four on the floor" policy with other humans?
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