^ In retrospect, I think the original film might have been improved by R2 uncovering at least some other Rebel prisoners from the Tantive IV in cells near Leia's, who could have died heroically creating distractions to help the main cast get away. The fact that R2 evidently discovered none and that Tarkin didn't mention sparing or exploiting them in some way could be used to argue that by that point they had already been dispensed with in some manner. Right away, Vader broke the neck of the one among them who probably knew the most. I get the feeling that by that point, he was getting frustrated with the relatively low-level Rebels he was having to sift through. Certainly, to keep the secret base secret, the Rebels hadn't been careless in letting people having knowledge of its whereabouts get captured.