I was swayed by this
interview with Jussie's lawyer - the main event is discussed from minutes 15-25 but the whole episode is about the case. The theory put forward is that the older brother is homophobic, was worried about appearances when the younger brother stayed over at Jussie's for one night & pressured him into sharing in their manly display of violence. Plus the sandwich wasn't Jussie's & he didn't want to call the police. Anyway, at the very least it seems like a plausible alternative narrative.