Battle royale scoring is not just kills
Professional matches in this format are scored on a combination of eliminations and where you finished, added up across many matches rather than decided in one. A squad can win a tournament without topping a single game, by surviving consistently while more aggressive teams trade themselves out early.
That is why so much high-level play looks passive to people used to watching shooters. Understanding the scoring is understanding why the teams behave the way they do, and a couple of questions sit directly on it.