>>8810454He didn't like the constraints and expectations of a real contract
Things came to a head when he violated the terms of his contract and also refused to get a shoulder surgery, then he exchanged a few heated words with an agent who he's apparently known for a while and then went psycho
Other NJPW wrestlers (O-Khan, Taichi, TAKA) thought he was being whiny and started burying him, as did wrestlers for other non affiliated promotions he's worked for.
He might actually never work for a japanese company again, he burned a lot of bridges. Maybe he can get some bookings in Dragon's gate?