Consistency can be elusive at the top level of sports, especially in team sports. I remember my brother-in-law telling me about a round of golf he had with a friend. They would hit two balls at every shot, and then play on from the best one. They both ended up with sub-par rounds. That showed that if they were consistent, they could approach professional standards. But without consistency, you don't get the results needed at that level.
With team sports, not only do you need everyone playing consistently, but you also need the other team to not play with the same level of consistency. The dynamics become a lot more challenging.