The part in Highlander 1 where connor is watching wrestling with Princes of the Universe in the background while also remembering his early years in scotland is meant to show how things haven't really changed atleast for Connor. Instead of cheering on your clan as it fights another, It's people cheering on their respective wrestler.
Grayson was Darius’s protege. He wanted Darius to create an army of immortals and take over the world. Darius finally agreed after they sacked Rome along with Alaric and the Visigoths, They then traveled to Paris where Darius found Emrys at the gates. He fought him and won, hence his light quickening. Emrys was 20, 000 years old , and knew what Darius and Grayson were planning . Either way he was going to prevent it from happening. He would either defeat Darius , or he would change him with the quickening. After this occurred, Darius went to Grayson a completely different person and Grayson felt betrayed and considered Darius a coward. Over the years he tried to create the plan, but he was never able to do it. His hatred grew over the centuries, and culminated in the fight with Duncan after he started killing off Darius’s protégés to try and draw him off of holy ground to fight him.
It's a shame you guys split the scene. It seemed like you had a good thing going, I guess it just didn't take off? If you're working on another channel I'd like to know.