I've always thought Todd was underused. I remember how back in the old JSA days (when he was a villain again) it was theorized that Todd - like the Shade - may be immortal since he can basically live in the Shadowlands forever. I like to theorize that Obisidian's powers (being all black and dark) can battle the Black Lanterns where others have failed since he is the opposite of emotions, the opposite of light - total darkness.
I'd also really think it fitting if Todd is the one to bring Jade back to life (and I really think she like Aquaman and J'onn will be resurrected when this is all over) considering she is the one person who has given him unconditional love (even when he was a bad guy) from the moment they were reunited as adults.