There was a popular television show in which the actors asked each other who’s on first, and what’s on second. They never could determine who was on first, but they always knew that nothing was on second. By the end of the show, there was no one on first, and nothing on second. In essence, all positions were open.
In God’s millennial kingdom, there is no one on first, and nothing on second. You can choose either position. You can choose to be on first. You can choose to have God place you on first.