I don't know for sure but I think Brenchel is staying in LA. Brendon has to go back to class and they need to find a place to live.

Brenchel (JJ too) all do not like Nikki-The woman in charge of the Vegas party. Nikki is supposed to give money to charity that the vegas party raises. All Nikki does is keeps it for herself. Nikki left Jordan stranded in Vegas before. Brenchel was supposed to get reimbursed for a car rental last year but it never happened.

ED hates Nikki but a ton of past HGs like her. Dani and countless others are friends with
Nikki to this day.