ok, so first i want to say i know this gives some people anxiety - i remember some people on bluesky freaking out when the holiday special described stede lying awake at night like he did with mary - so let's start with remembering you can't push this analogy too far. stede's relationship with ed can't be just like his relationship with mary because there's already some key differences; for one thing there's no previous happy state that stede and mary decayed from, we saw the way their relationship started and it was miserable from the beginning.
but there's going to be some similarities for sure, and we can guess at it partly just by looking at the other evidence we have for what djenks is thinking about for s3. we have a fair bit of it now - there's the whole bsky special, and a list of songs, and he's gestured repeatedly at some key themes like "what if one of you grows while the other stops growing." but a big one, imo, was that he mentioned at BOF2 that a big theme in s3 would be learning to communicate, especially for stede.