I had not considered the cable freezing. I've never heard of moisture entering the cable and freezing (although I did not grow up around these low temperatures). My focus was on the rotor since it showed an unusual wear. Because of this, I decided to replace the caliper as well.
I am assuming moisture has pobably corroded the cable. Do I replace the entire cable or simply lube it to displace the moisture inside? This is an area I'm not familiar with.