1) Disney is getting wise to the "but, they decided to join us" trick.
2) Especially with free
DDP, people can't always get the ADR they want.
3) So, they under-count to get a table.
4) Then, they show up with "unexpected" additional people.
5) In a team meeting, CM's have been told to warn guests against this.
6) Sure, if there is room, WDW will not turn away revenue.
7) But, if busy, they will turn away the additions.
8) Go ahead any arrive with the extras, if you like.
9) Just be prepared to have someone stand around while you eat.