Gresham and Grace both have played themselves via Twitter, they're perfect for each other, in that aspect. Four years ago, he was breaking out as a talented technical wrestler. Since then, he's created a career out of making an ass of himself.
After stalling in momentum, he eventually outplayed his hand in ROH. Final champ of the Sinclair era, with a transitional title reign he strove to make worth something. Many crossover opportunities, even a boost to his own promotion. His ego is in the way.
Seems less like he was fukked over, and more like he forgot how to be humble. He has aired legit gripes about the perceptions of black wrestlers recently, not doubting what he said there, but it seems like sour grapes too soon. If there's one person he won't garner much sympathy for having been beat by, and for supposedly working harder without being given proper due, it's Castagnoli.