While watching S5, I did a full show rewatch (just finished S4) and am impressed with the set up that was going on for 5. I didn't realize that Bobbie's last job with the criminal crew involved the theft of Martian stealth tech. I guess I forgot about Marco's extended appearance at the end of 4 - though he wasn't on long, they really do let him talk way too much. Really, Ashford could have killed Marco before Filip got the drop on him. I think Keon Alexander looks like he could be a charismatic leader but a combination of the dialogue and the acting choices are not working for me.
Drummer's decision not to agree with Marco's execution is a really bad one, in hindsight. It feels like there are inconsistencies in her characterization - then she gets angry at Fred for leaking Marco's location to the "inners"? She should have just executed Marco then, what did she think would happen? I understand her point, kind of, but unfortunately the Belters are proving the inner planet guys right, the Belters can't/won't police their own. Yet Earth and Mars are way too heavy handed and of course, no one really expected rocks to drop on Earth. Even Ashford was expecting an attack on Ceres or Tycho.
The conflict on Ilus works as the microcosm I think the show was going for - the Belters were refugees from Ganymede - nothing that happened there was their fault ,yet no one would let them land. They make it to Ilus and then the scientists and Murtry's guys show up as the Belters are trying to make a life for themselves. They shouldn't have blown up the landing pad but Lucia at least was not expecting casualties - yet violence usually does beget violence, though Murtry of course went too far and on and on.
The Lucia arc I can see was the impetus for Alex contacting his family at the beginning of 5, which seemed to come out of nowhere for me. Alex is also kind of all over the place - we know from the beginning of the show he has a wife and son yet they seem to want to portray him as a free wheeling, flirty type - bad choice because of the actor and it doesn't quite work for the character. Then he grows into cook/medical guy. I really hope the character is re-cast and not killed, as I like the current iteration of Alex as someone who is starting to recognize his mistakes. Sometimes all you can do is recognize you screwed up and keep walking forward and try to do better. Naomi's talk about her past with Lucia, after Lucia tried to die, illustrates this really well and gives us the background for Naomi's actions in 5 - I had forgotten we get the real details about what Naomi did and why she left Marco.