It's simple. Any updater can update a game (thus the name). If you have a prepared game with a review - no problem! You can send it to any updater and they can put it up - or put it among the games that are ready to be updated (so it will be there soon).
But if you only wish to contribute a game archive - and somebody else should review it - then it's better to send it to Tom or Kosta, because they can update the
Games That Need Reviews & Screenshots list.