We have worked with 7 or 8 different greenkeepers in Australia now, including Leigh Yanner, and I would take any of them to run one of my courses any day.
When we set up the Renaissance Cup, I felt guilty for exposing Leigh -- here we had a big group coming from all over [including seven or eight top end greenkeepers] to play a course that still hadn't quite had time to mature, just a couple of days after playing at Royal Melbourne in peak form. He did not even blink about it. Come next summer, I would not be surprised if he has the best playing surface of anything in Australia.
I did wonder why they were going out at dawn when there aren't any golfers around, but I guess it's to space out the crew so they aren't all in the building at once.