The two players have only been on the same team once, at the 2015 IIHF tournament, when MacKinnon was not the player he is today. Mac is considered by many, including me, to be the best player on the planet. So at the next Olympics, he will be one of the headliners on the Canadian team. Who will he play with? No idea at this time, but one thing is set in stone: he will be used on one of the first two units.
In short, the two men met for the Tim Hortons commercials, then instead of wearing their respective jerseys, they would wear the colors of Canada since it is an Olympic year.