If you leave them standing, the trichomes will continue to turn amber on the plants that are ready now. If you genuinely can't hang those plants elsewhere whilst you wait for the others to finish, I would probably seek a compromise - leaving them all up for as long as you're willing to do so, and cutting them all down at the same time. 2 will be slightly overdone and 2 will be slightly underdone, but that's probably the best option you have.