Its actually the very opposite. ZD8X and TO2A were both working the pile-up by the numbers on the first day. N6KT (TO2A) is one of the best SSB op's in the world. It's done to thin out the pile-ups so they can hopefully pull out full callsigns while still keeping the rate very high.
I think it comes down to them not having enough patience or enough operating skill to participate without resorting to working by the numbers in a worldwide contest.