Hi guys I would like to add an insane 16 run for boss fight. I was playing with a club mate and someone who I found using Looking For A Team. Neither of them have SRC accounts. Should I submit 1P, 2P or 3P?

You should submit as 3 player. When you submit, you can either put their names as their Brawl Stars names or just Random Player since neither of them are on SRC.