It's easier to ask forgiveness than it is to get permission.
Speaking with the Wrestling Perspective podcast, Rocky Romero was asked whether or not Kenny Omega and The Good Brothers (Doc Gallows & Karl Anderson) were given permission to wear Bullet Club apparel at IMPACT's Hard To Kill PPV. Here was his response:
"They did not get the okay to do that. They did not. It was a little strange for a second. I think it's okay now, but it was kinda out of left field. I think everyone was just a little taken aback for a second, but I mean either way I'm sure it was good for Bullet Club t-shirt sales, so I mean it all worked out in the end."
At the event, Gallows and Anderson wore their Bullet Club jackets to the ring while Omega donned his Bullet Club Halloween shirt. The men were victorious that evening, defeating the team of Rich Swann, Chris Sabin and Moose (who was a late replacement for Alex Shelley).
AEW and IMPACT have been crossing-over ever since Don Callis helped Kenny Omega win the AEW World Championship from Jon Moxley. Over the past two months, The Good Brothers (Doc Gallows and Karl Anderson) have been appearing regularly on Dynamite, while Omega, Matt Hardy, and Private Party have shown up on IMPACT.
New Japan Pro Wrestling has entered the fray now, too. After Jon Moxley's surprise attack on KENTA at NJPW Strong, the Bullet Club member returned the favor by jumping Moxley at the end of February 3rd's Dynamite. The two will face off for the IWGP US Title on February 26 at NJPW New Beginning USA.
If you use any of the quotes above, please credit Wrestling Perspective with a h/t and link back to Fightful for the transcription.