Sam Couldn't Carry the Ring for Frodo,
But he could Carry Him!
http://www.youtube.com/watch?v=O_NmCh42hZM
Aragorn and Gandalf didn't destroy the Ring.
The Smallest of us change the course of the future.
And Aragorn said, “Let Mithrandir set (the crown) upon my head, if he will; for he has been the mover of all that has been accomplished, and this is his victory”.
And Frodo would never have been motivated to leave the Shire without Mithrandir.
Mithrandir refused the Ring. Frodo at the very end, claimed it for his own.