I didn't hear that but yeah, I agree with you.Also I suggested one more formation lap before the race started since it was so spread. In karting its the pole car who are responsible to gather the whole pack before the acceleration point. Dunno about car racingSome live steward to decide these things would be very nice in the future.
The leader should check if everybody is following. I guess it's a lack of experience.
Anyway a clear warning from the back would be useful.