We could see what chemistry Aiden has with Davey and/or Dirk? They are different houses but they are year-mates. Davey is pretty easy going, so a bit defensive might not bother him, and Dirk is somewhat awkward but not likely to provoke Aiden so much.
Ditto for Thomas and Caradoc? They are year-mates as well, so we could see what their energies are like.