Tommy Fleetwood shot a 63 on Sunday. I think Rickie Fowler shot a 65 on Sunday, he shot an 84 on Saturday. Even Mickelson I believe shot below par on Sunday So they obviously watered the greens and made for some more favorable pin placements. And also the wind was not bad on Sunday.
I do agree with a rotation of course. Shinnecock is a great track but it runs the risk of being a -20 winning score, or when they trick it up and wind blows, it is almost unplayable. So it is difficult. But I have been saying this, Shinnecock, Winged Foot, Oakmont, Torrey Pines, Pebble Beach, Pinehurst, Olympic (San Francisco) should be the rotation. I like Merion too.
But we can also see, Pebble and Torrey also host regular tour events, and for the US Open to go there, you have to make the course tougher and different than what a Pro Am plays there.