Theory: CRAZY Green Lantern idea by me

What if Steppenwolf captured a Green Lantern when he first arrived on earth and he is holding him ever since and that GL will be free at the end of the movie and will help the JL during the final fight? Abin-Sur maybe? And if he is Abin-Sur probably he will die during the fight then in the credit scene we will see Hal Jordan picking the ring.

That would be AWEEEEEEEEEESOME