Logan is a very compelling character as he has such a rigid and damning moral code, yet his self-righteousness does not dominate him or feel like hypocrisy. I always think of those scenes where Winter was dying, and she begged him to tell her that he loved her. That was her dying wish, but, because of her actions and because of his honesty to a fault, he couldn't bring himself to say it, even as he watched her die.
And I figured the Lumina story was also supposed to include Marley since he mentioned being intrigued with her..and wishing to know more about her.
And didn't Felicia vanish, only to be found in a different costume as well?
Sometimes characters that were supporting in one story became the main player in the follow up.
Bobbie Gerald was a minor player in the Emily pregnancy story..with a more supportive role in the Bryson story..before becoming a bigger player in the faux Sky Whitney story.
Same with Emily and her maid...each played a big role in future mysteries once the initial Draper amnesia story concluded(and I think the Emily thread was dropped before its natural conclusion thanks to Draper/April leaving and the writers strike).