It's funny how they made getting XP a whole lot easier for Battle Pass owners this season but so far there is only one skin (Rox) where XP matters in unlocking things (at least up through Vega, the latest skin I've unlocked). As a Rumble addict, those "outlast opponents" for unlocks can go fly a kite. I've still got the friggin' Ice King from season 7 on my challenge list.