Interestingly working from an ensemble cast 'pool' is something a lot of the directors mentioned in this thread do, or at least they have favourite cast members they work with time and time again.
It's most marked in both Wright and Smith's work, where their back catalogue generally sticks to a certain style and and uses the same actors.
It's not necessarily a bad thing, Mike Leigh is hugely critically acclaimed and has worked with a number of the same actors in different films and has a very set style.
It would be nice to see Edgar branch out, but I think it's more important to show progression in terms of quality. Who knows he could be an auteur... one day.