Rankings are taken as the nearest in a straight line to the stage finish in Capetown. Even if you were a mile behind someone, due to the numbers playing there will be hundreds if not thousands along the band that is equidistant. I’m out to the West, the new leaders are about 12hrs ahead of me but in the rankings I am still behind a boats as far back as the Canaries because they are nearer to Capetown as the crow flies.
Have a look at this map. It shows the first 10000 on the leaderboard. The sharp edge along the northern side of the boat plots is where it gets to 10000th place. Everyone along that edge is in a similar place on the leaderboard so by moving a little closer or further away from Capetown you will make/lose loads of places.
Think I’m going west of Cape Verde, there seems to be a bit of a lull to the east for a few days just as we get there plus any wind there is is blowing directly due south rather than at an angle.