Grayson left of his own accord last year. He's confirmed in interviews that AEW had offered him an extension but they couldn't come to terms. He admitted that while he liked working there, it was getting frustrating leaving Canada and flying into the US every week just to be booked on Dark again so it was time to test the waters.
So either they've pledged to book him more or are paying him enough for he no longer cares. Plus it was May when he left, it's 10 months later and he didn't sign anywhere else so maybe he decided to just tap out and take what he could get.
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