Hit the replay button and it will show you each players positioning the entire fight. Or the time table to check incoming damage to see who has aggro, who stopped attacking, etc.
Also what you said doesn't make any sense. Assuming players are bouncing aggro they will stop DPSing so of course FFlogs will reflect that.
It's a powerful tool for players to improve their gameplay and understanding and only ignorant players try to demonize it or use it as some kind of trophy.
