For McIlroy, the one that got away may actually set him on his way

If failing to prepare means preparing to fail, the question about how to prepare effectively must be broached by any self-respecting high performing athlete and coach. Mind you, there is no answer that will serve everyone equally.
In fact, preparation for one event may not work appropriately for the next event. If we accept athletes and coaches are complex beings, then we must also accept they are in constant flux, as are the environments and events they engage in throughout a season and ultimately, their career.