That is amazing!Just did some research because I was wondering the same thing. Here are some things to note about the predator/star sapphire:
1- Predator is just like Parallax and Ion in that Predator is the living embodiment of love
2- Before revealing that Predator is the living embodiment of love, Predator was created as the "masculine" side of Carol Ferris, and came out to defend Ferris Aircraft when it was under attack (Star Sapphire split herself into these two halves; Predator and Carol Ferris). This was of course after the Zamarons chose Carol as their champion.
3- The Star Sapphires (violet lanterns) imprisoned Predator inside of a crystal chamber (violet lanterns power battery) at some point in time.
It seems IC took an amalgamation of these 3 facts along with the history of Star Sapphire and created the games version of the character