In Sub-Zero's ending, it says that he was heading to rendevous with Raiden and the others (presumably for the attack on Shang Tsung and Quan Chi) when he was ambushed by a squad of Tarkatans.
In Kenshi's bio, it says he met up with Sub-Zero, and Subby told him that he had fought Hotaru after defeating a brigade of Tarkatan warriors. So... Sub-Zero's ending actually fits more into the beginning of the Dragon King story -- It seems by his ending, he's fighting Tarkatans rather than assaulting the Deadly Alliance with Raiden, Cage, Kung Lao, et al. He then fights Hotaru and meets up with Kenshi, as near as I can tell. It seems this ending has to be the incident mentioned in Kenshi's bio, because when else would Subby be trying to meet up with "Raiden and the others," other than to attack the Deadly Alliance?
Just seems weird to have a character's ending mentioned in another character's bio.