Definitely understandable.  I wouldn't worry about waiting for DD since he plays a Gryffindor student and your characters are at their tables.  Bobacca might get left behind, but he hasn't posted a character sheet or replied back in a little while, so not sure what is going on with him.  As for AA, her character is hot and good at Quidditch.  She will have plenty of people talking to her once she is able to post.