Eddie can mix it up (clinching, TDs, striking, etc.) and take the decision victory. Similar to GSP. Or he can strictly use his grappling to grind out Conor. Eddie also has the power to finish McGregor (Conor still holds the edge in this category). Alvarez is the better overall fighter, although Conor is the better striker (Eddie is a good striker in his own right). Eddie has better cardio and is the stronger fighter. The big issue with Eddie is that he has a tendency to get hurt in his fights. This is a bad mix against somebody like Conor, who has power and great finishing ability. On the flip side, Eddie has great recovery.
I'm picking Eddie to win. But Conor can take it as well. I favor Eddie 60-40 in this fight.