that is NOT true... we had two rooms, two ressies, two sets of cards, four people... i had 1A/1C on my card and dh had 2A on his (one kid was 9, the other 11)... i was ordering for dh/i (we constantly mixed and matched our credits w/minimal hassle) w/my 1A/1C card at a CS restaurant and was DENIED 2A meals... my stance was if i had 10 A CS credits available (which i did!) i should be able to order all TEN of those meals at one time/one place if that were my desire (to be a glutton or to feed the birds! my choice!) and again, even with management interference, i was DENIED! dh had to bring his 2A card to my rescue (from halfway around the World Showcase) so i could get the second meal...
btw, this was at Mexico CS and the kids (neither the C nor the A) were eating but rather were heading to eat in America where the fare was more their style... and we were going to meet w/the food in the middle...
so, some CS CMs *DO* care how many is in your party size!