“Cyborg is the heart of the movie,” Snyder shared at FanDome. “Cyborg is the thing in the end that holds the team together in a lot of ways.”
Most of Cyborg’s origin story was cut out of the theatrical version. Him learning to fly, use weapons, hack into other computer networks, etc. Also, his deeper connection to Mother Boxes, since he’s basically born from a Mother Box. It’s reported that a full timeline of the Mother Boxes, up until Victor Stone’s transformation, is shown. All of Victor’s arc was shaved down to the bare minimum.