A wonderful conclusion to an excellent series!

Miller returning to aid Jim lessened the heartache of all the folks lost along the way.
Alex seizing the chance to be a father and grandfather helped lessen the blow of Jim's sacrifice.
Amos still being around after a millennia assures that Naomi and Theresa made it to the Sol system while sparing the reader the full brunt of Jim's loss on Naomi.

All in all, a wonderful yarn of a flawed species and individuals that can manage to find joy in the midst of sorrow, hope within despair and humor even at death's door