What can i say? The cub loves gaming,he won't hide it nor deny it,he and Rebecca are basically rivals! Trust me,once the match starts they would stop being brothers and it would become full on competition to see who gets more kills or who can get on the first place! But when they are not tearing each other apart they help each other,either by playing co-op or by just sharing experiences and advice!
---0--- As a final point Starcross is a fictional franchise that resembles,or rather is a parody/homage to Halo,specifically the original trilogy created by Bungie (from 2001-2007!)