The flying high knee is also eerily similar to Nakamura's Kinshasa finisher (which at times is done from off the top rope). So I think it is a no go due to them wanting to protect Nakamura's move.The diving high knee kind of reminds me of the phenomenal forearm just because of how it is presented, it is a good finishing move but I am not sure WWE would want something that is so similar to another big superstar because they want to differentiate the big superstars