SonicMario
Star Spirit
Yeah it's nothing to really debate about. There is just going to be these contradictions like these in a cartoon like this.
Because I wouldn't lose sleep if say we see a Pony hold a small cup in the next episode. Though honestly the bigger problem is when any Ponies that take as many cups as Pinkie did... especially when she basically gloats about it in front of Rainbow Dash who really really wants one. If Pinkie had taken off a few from her order. Rainbow Dash would of got some. But judging by the line even if Rainbow got there there still wouldn't be enough for everyone. So your stuff on smaller cups would still stand.
Because I wouldn't lose sleep if say we see a Pony hold a small cup in the next episode. Though honestly the bigger problem is when any Ponies that take as many cups as Pinkie did... especially when she basically gloats about it in front of Rainbow Dash who really really wants one. If Pinkie had taken off a few from her order. Rainbow Dash would of got some. But judging by the line even if Rainbow got there there still wouldn't be enough for everyone. So your stuff on smaller cups would still stand.