If you look at the master roster, the guy was on an O day not a G day. How do you know he didn't have a roster change from an O to a trip.
Wom, you need to pull your head out from inside your arse.
The pilot in question was on an O day followed by G days. He had to agree to give up his G days in order to operate the flight. It's too difficult to see. Just as it's not too difficult to say "no".
Sorry, but my head is in the clear, how about yourself?
ps - wrong guess at nationality, but I still receive 3's for comm nonetheless...