#4. Has till October to work extra dates
What we know so far about the AEW talent is that they have till October to work all their extra dates, after which they'll likely be bound by contract because that's when television tapings begin.
That itself will change the whole deal, but for someone like Moxley who's been itching to get out and do his own thing, NJPW presents the perfect opportunity. He has till October and it won't be surprising if he makes multiple appearances for the promotion during that time.
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Moreover, we don't know the details of his contract yet, so there might be a loophole for Moxley where he doesn't necessarily have full exclusivity to the promotion as we may have thought.
Or, it's highly possible that he had high bargaining power when making a deal with AEW and stated his intentions to make the occasional appearances outside, even on contract.