One time, I entered a comp match with 0 opponents and we won. Last time, I entered comp match with two people missing from my fireteam, and we lost all the rounds. This is crazy because in Overwatch, their solution to a simlar problem was to load the game but if there were not enough players at the start of the match, it post pones the game until all the players load in both sides. While you are waiting for players to start the match, you can fight players in the map until the missing players load in to start the actual game.