Things we did exceptionally well:
Good selection trials in Florida - while FL sucks for indoor WC prep, between the ring and heat/humidity factor it was probably very useful, and of course it didn’t hurt that Palacios and Stephens’ courses are the normal fare for WEF. 
Committing to Sapphire and Authentic early in the process and letting those riders craft their prep towards the Olympics has to help, don’t you think?
Being smart about Will’s decision to skip the last trial due to his horse’s minor injury after the storm.
Getting two teams (consisting of likely olympic caliber rider/horse plus possible olympic rider/horse plus future olympic riders) to compete in the Super League in the Nations Cup format all summer long. I think both the repeated exposure to the format and the level of competition is a major factor. After Winter and Spruce Meadows, in this country these 4 riders only have to beat each other, it’s got to be useful to constantly be up against a much deeper pool of talent.
And I think you have to credit the team and the Chef for peaking at exactly the right time, but I suspect most of that credit goes to the Chef, because if it hadn’t worked out, he’d get all the blame. 
It’s definitely a bit of luck, but I think you have to be both good and prepared to capitalize on luck.