There isn't enough restaurant capacity for everyone to get a 6 or 7p dinner reservation. My guess is famlies with kids, who get to the park at rope drop, will take the earlier dinner slots and couples (and famlies with older kids) are more likely to take the 8p and later slots. Most of us will adjust out lunc to compensate for an early or late dinner.
Some guests, who want to eat at 6 or 7p will just select a restaurant that has availability for their desired time.
Some guests, who want to eat at 6 or 7p will just select a restaurant that has availability for their desired time.