I think the expectation is that it will be very close until one team reaches beyond the threshold. Then even if that team is only one month ahead, they will always be one month ahead in terms of time to catch up, but in terms of performance at a particular time their lead will continue to extend. So users will use the winner's tools, or use tools that are inferior by many orders of magnitude.

This assumes an infinite potential for improvement though. It's also possible that the winner maxes out after threshold day plus one week, and then everyone hits the same limit within a relatively short time.