I don’t think NJPW benefits a hell of a lot from the relationship but ROH certainly does. They aren’t selling 500 tickets for a show with Jay Lethal vs Dalton Castle, but they can run the Garden with Okada, Omega, Tanahashi, etc. They wasted the Bucks in their first run before they went to NJPW and were literally drawing houses all over the country on the indies. They wasted Sho and Yoh. I guess they signed Cody first but Cody wasn’t THAT hot til the Elite stuff and the Bucks/Kenny somehow did the impossible of making Cody fucking Rhodes “cool.”
ROH mostly serves as a vehicle to get the NJPW guys into America on a decent-sized platform, and is essentially the wrestling show for Being the Elite. NJPW doesn’t really use true ROH guys that much, though Beer City Bruiser did great earlier this year when he was there. Cheeseburger is over in Japan. War Machine was alright. Elgin doesn’t work in the states at all right now. Chuck Taylor had a run in the tag league with Greg but I don’t think he’s been back.