It’s one of the places where I would’ve loved a few more episodes to really process the fallout of all of Bojacks story coming to light
I think Kelsey realized what Gina went through and reached out to her. That’s why in the final episode (or second to last) you see Gina is starting in the movie Kelsey is making despite her having been warned she’s difficult to work with. But I really would have loved to see that play out.
I think as long as Bojack would have accepted the lack of forgiveness on Herbs part, Herb would have been able to forgive BoJack even when he thought he was dying of cancer. But when BoJack couldn’t accept Herb not forgiving him, he showed that BoJack was still unable to center the pain of Herb above his own need to absolve his guilt.