When one day captain Andor leaves on a suicidal mission (which are most of his missions) and does not return to the Alliance base, K-2SO has already calculated the probability of it. It was high. Very high. General Draven himself comes to bring the news to him and, among other things, out of respect for Cassian and his heroic deed, gives K-2SO a choice: to either be reassigned to another agent or to be allowed to go into a sleep mode for as long as K-2SO would like to stay in it.
    Apparently that was Cassian’s instructions in case he’s KIA, and K-2SO is left all alone. Apparently, Cassian even had those instructions thought up and prepared, and somehow he even convinced general Draven to follow them. K-2SO is impressed if—unemotional droids are not supposed to have any of it, but K-2SO is close to calling his state how an organic would call it—grief.
    Still, he evaluates his options. There is 79% chance that whoever he is assigned to is nothing like Cassian, with exception of gender, age, rank and field or expertise. There is 99% chance there will never be another Cassian. But K-2SO still picks an option to be allowed to go into a sleep mode.
    His request is granted.
    And so K-2SO stays absolutely still and switched off, stashed in the furthermost corner of the Rebellion base on Crait, the last base his organic partner has ever visited. He is quickly forgotten, only ever staying in stories Rebellion intelligence officers tell their children of the brave and daring captain and his—very scary—but very loyal droid.
    Nothing happens to him for long, long years.