Originally Posted by
LuckyDenver
While I'm glad for you, I think I'm now even more frustrated/confused as it adds to the "no rhyme or reason" theory...

Yet another data point! I did a SDC to earlier flights originating from an international departure giving up my upgrade to do so. I received the upgrade email for the new onward flight when it had already gone to gate control. Having been upgraded, I didn't pay attention to see if I was on the upgrade list or not.
James