Spooky's journey throughout season three is a rocky one. He juggles Cesar's teenage angst, his father's surprise return, and Cuchillos's constant threat lurking in the background. He fights to keep his neighbourhood out of the hands of rival gang 19th Street and keep his brother safe. In an argument with his father, Spooky reveals that he was just a child when their father went to prison, but he had to step up to raise Cesar as the man of the house. Then he joined the Santos and essentially killed any semblance of a childhood he could have had.
When their father leaves as quickly as he blew back into their lives, Spooky must contend with the threat that remains: Cuchillos. He goes to the 19th Street gang to arrange for Cuchillos to be killed during a meeting, but she learns of his betrayal and gets them to double-cross him. Spooky convinces 19th Street to stick to the original plan and strike a truce.
After the deed is done, Spooky is happy enough for a celebration. He tells Cesar that he's trying to live for a better tomorrow, where he can have a family and be happy. In the flash-forward, he has exactly that, sporting a full head of hair and kissing his visibly pregnant partner. We have a feeling he's started going by Oscar by then.