This isn't line of duty, everyone!
Chekhov's clutch is important. Ryan is just vulnerable. The dynamic with the abusive teacher has already been explained by Joanne- he finds these lads, breaks them, then gets his narc supply off making them teacher's pet.
Joyce is just Joyce - she reflects the audience. Loves Catherine, finds her infuriating, and noses at the screen so we get a look.
Pfizer is a gonner, but later. He will have killed Joanne. TLR is a manipulative shit- no redemption arc there. Tweedledum or Tweedledee will steal Alison's double declutch wagon, and mow down someone we care about. Richard is wet and useless- there's a theme of the strong but broken woman surrounded by these soggy marshmallows. There will be a tense finale, and Ryan and Catherine will go to the Himalayas.