Should GAC award bonuses for attacking earlier?

Attacking 2nd is definitely an advantage. Most of the time, imo, it isn't sizeable enough to impact the outcome. As such, even though it's advantageous to go 2nd, I dislike the idea of bonus points for going first (also because of time/availability restraints).

Hiding the scores makes the most sense to me. But CG does not care about this, and there's a lot of people on the forums that are vocal about their rejection of your premise; so you're wasting your breath, OP.