Totally true.
Paul London has went out and had great matches in ROH with practically everyone he has faced. Micheal Shane, Spanky, Samoa Joe, AJ Styles ( which was one of the best matches I have ever seen in ROH ), and then went to TNA and had a great match with Chris Sabin.
As for Low Ki, I reckon that guy is world class. He proved his class time and time again in ROH.
American Dragon is my fave worker in the US right now though, because recently, I have watched his matches with Low Ki and with AJ Styles, and they were better than most of the matches I have seen from any wrestler so far this year.