The others will get what rng gives them regardless of whether they made it to the boss or not. You're the one that chooses to run ahead, you're the one that decides when the strike ends and how much work your teammates do to participate in the completion of the strike. I always rush, I'm always the best and people still get better rewards than me sometimes, but because I spent so little time in that strike, I can get on with the next strike and try for something awesome again.