Actually you are looking at this the wrong way. Rory Mac missed the cut in a tournament last week, so went off to Olympic to play 3 practice rounds. He will probably play 3 practice rounds this week as well.
So he will play 6 practice rounds. He doesn't have to qualify because of previous performances/world rankings.
We don't have world rankings, and if we did, a lot of people who are moaning about qualifying still wouldn't qualify.
And most importantly, this is only a game. If you want to qualify, you need to have good clubs and a steady meter, and above all else you need to play the course againa and again and again ... etc
Mind you all the above is easy to say when you are tied 5th.
The white cap looks nice, and will look nice on my head to match my grey highlights