Kurt only had a cup of coffee in NJPW
Beat Brock...not sure how this "real IWGP champ" stuff works
According to wikipedia:
In 2006, Brock Lesnar was stripped of the title for being unable to defend it; however, Lesnar claims he was owed money by NJPW and kept the physical belt. He signed with Antonio Inoki's Inoki Genome Federation (IGF) in 2007, and lost the championship to Kurt Angle on the inaugural broadcast.[6][7] Angle later lost the belt in a unification match to the NJPW-recognized champion Shinsuke Nakamura in 2008.