His TNA run
WWE never used him right as a singles wrestler, even when he won titles. TNA, however, gave us Christian Cage...
He was gold on the mic, especially as a heel. I remember when he used to constantly son AJ, until AJ finally had enough of that shyt.
He was putting in work in that ring
Nikka had great matches with everybody... Joe, Angle, AJ, etc. TNA circa '07 was godly, and got me back into wrestling, since I had stopped watching WWE a few years earlier.
Lastly, he had one of the GOAT theme songs...
I doubt that TNA got permission to use the song but it's a great song.