Logline
Who knows? They never released one.
Edit: They finally released one - how novel to release the actual episode first!
Captain Freeman assigns the Lower Deckers an overly safe mission to try and keep a self-destructive Mariner out of danger.
Written by: It’s a secret (it was Mike McMahan)
Directed by: We’re not tellin’ (it was Brandon Williams)
I think the official explanation is that they thought about it and judged Locarno as irredeemable - “a bad guy in the guise of a good guy” whereas Paris was supposed to be “a good guy in the guise of a bad guy”. But I tend to agree that money was the determining factor, as it so often is.