Collin Morikawa is an absolute gem. Rory will feel hard done by with his approach hitting the pin and ricocheting into the bunker forcing a bogey, but I think the momentum was changing at that point any way. Morikawa played Tiger-like golf for a lot of the tournament, not necessarily birdieing most holes (he had 2 birdies and the rest pars in about a 25 hole stretch), but he was ticking along and not making mistakes. Then, when he had to, down the stretch he turned it on and won comfortably.
I remember watching a clip from an interview with Lee Trevino who said how important a killer instinct is. You can have all the shots or whatever, but you need that killer instinct. Morikawa most definitely has that, ice in his veins. He's gonna be a big problem for a long time.