I'm not reading too much into the week (or even this year in general) because this was always going to be the quietest year of the current Olympic cycle - with Euros and Commies next year, then 27 WCs and finally LA, there's an obvious build up over those three years, which will each bring their own pressures. So this year, across many of the Olympic sports, is the one to...relax.
Obviously they are all still professionals but it is fairly clear that some are not quite at their top. Some have been more open about it than others (Peaty obviously, Dean as well). Which then leads you to wonder whether that is more widespread than we think - to use Oli Morgan again - could he actually not be working at 100% this year and actually capable of even more than he has shown? We'll never know, but it isn't impossible to imagine.
And in swimming especially, with the illness that we know hit the US and has seemingly hit others (I believe GBR shared a training camp with the US, so it wouldn't surprise me if they were caught up in it), these Worlds shouldn't be read too much into.
But all that said, fly is still very obviously the weakest link, especially in the absence of a WC women's backstroker right now. It's not that our swimmers are underperforming, they just aren't yet quite showing they are capable of keeping the distance to the top nations down right now. We're still looking like we're giving up at least a second in both the men's and mixed relay on the fly and we don't have Adam operating at a level where we know that he's definitely going to be at least a second ahead on the breast like we used to.
As you say, Ed and Keanna have both had solid weeks and there are green roots elsewhere - Dean Fearn had a good Euro Jnrs. Theodora Taylor is gifted in pretty much everything, so could develop her fly (although the free is probably her likely spot). And Blythe Kinsman is probably the best bet for the backstroke spot right now. Those latter 3 combined with Nowicki to dominate at the Euro Jnrs in the mixed medley.