He is one of those who usually rewards positive, confident riding, which is good. Adding strides can easily get you in trouble on his courses, even if it may be a natural instinct that going slower means safer... Also he gets praised for building horse-friendly courses, where inexperienced horses can build a lot of confidence during just one run (again, if ridden positively).
Most of all, he seems to be very unpredictable. His Kentucky course from last week was very different than the one from 2018, so really nobody can tell what he is cooking up for next year. He used a lot of terrain in Kentucky, but I wonder if there will be any terrain available at the Tokyo course, which is right by the sea (hopefully some hills will be artificially added if it's completely flat)...
Some quotes on his Kentucky course can be read here.