I'm just now catching up on this show - been binge-watching it for the past two weeks and will anxiously watch the last ep this weekend.
I was thinking that Wendy wouldn't have taken Ben back to Darlene's because then she (Wendy) would be beholden to Darlene, and that's the last thing on earth Wendy would want - to be indebted to Darlene for doing such a big favor.
Ben bugged the crap out of me but it seemed logical that he'd make an appearance at some point, after he was first mentioned much earlier in the show (when Marty and Wendy were so concerned about Jonah's behavior). As Ruth is my favorite character, it was nice to see her have someone truly care about her. Marty cares for her, not romantically, obviously, but he is always so quick to shunt her aside and cut her off - he's always telling her "Later, later, not now, can't talk now." For better or worse, Ben was always there for her and put her first. With a family that treated her like crap (deserved or not), it must have been stunning for her to be the recipient of Ben's affection.
As for whether one can root for Marty and/or Wendy - that's a great topic with lots of meat on the bone. I for one do not like Wendy - there is something about the character that grates on me, and I think she and Marty bring out the worst in each other. I feel like she's an intrinsically mean person. Marty of course has done awful things for over a decade but they weren't "mean" things (not that they were good things either!) He also seems to possess the ability to look after another person with best intentions. He destroyed Rachel's life but tried to do right by her at the end of her story line. Whereas I don't think Wendy would've done the same for Rachel. In some ways, I am rooting for Marty on his own. Yes, he's working for a horrible man, Navarro and that's a choice he made, with consequences...as he is so fond of telling Wendy - choices and consequences - but I sorta feel like he is compartmentalizing everything and trying to do what he does, with blinders on. The dirty, awful, bloody, deathly part of his job he shunts off into a corner.
If Maya is about to have a baby, will someone take her place if the warrant gets extended? As mentioned, I haven't yet seen Ep 10, so perhaps that will be answered.