Re: 'All Our Yesterdays' theory
That's clever, but maybe those disks wouldn't work, same as the phasers didn't work. Also, could be that preparing certain kinds of tech wouldn't help either. For example, maybe the phasers would stop working as soon as they were prepared.
SPOCK: Sir, you are employing a double negative.
The phasers didn't work for Spock and McCoy, who had not been "prepared." Yet preparing anachronistic items will stop them from working? Huh?
"No, I better not look. I just might be in there."
—Foghorn Leghorn, Little Boy Boo