The Myiarchus is definitely interesting. This morning I was looking on my phone while taking the subway across town so I'm going to try to ignore my initial jizz-based impression and take a better look.
No Myiarchus is expected in Cuenca. Which means this is either a local vagrant or a long distance migrant, so habitat and expectations don't matter as much.
I agree the coloration looks off for Pale-edged. The lack of mousy / brown tone in the cap and the greenish shade on the back do not point at that species. The literature I have handy and can find online seem to point at Pale-edged having concolor back and cap.
It looks generally ok for Short-crested, structure wise, but color is a bit cool / gray toned. It's just two photos, and color is hard to interpret sometimes. However, even if you take the cap and cheek color to be ok and just a lighting effect, the back is quite green/olive toned and all the verifiable photos I find show a more dusky / mouse-colored back that matches the color of the cap.
When you get to Dusky-capped it gets more confusing. You have three subspecies in the area - the Western lowland birds are
nigriceps, the S Andean birds (and continuing down into Peru and Bolivia) are
atriceps, and Amazonian birds are nominate
tuberculifer. I think
atriceps would be the expected species here. The cap color and the greenish cast on the back actually looks pretty good for me for atriceps as well.
Here's a photo of atriceps that shows the back color well:
https://www.hbw.com/ibc/photo/dusky-capped-flycatcher-myiarchus-tuberculifer/perched-lateral-view
I think the photos are amply good enough to rule out Brown-crested Flycatcher (cap color, lack of rufous in flight feathers). I think Great-crested would be extremely unlikely and the lack of pale base to the bill and lack of rufous flight feathers rules that species out.
Dusky-capped has a lot of subspecific variation. I don't know, Niels, if the strong pale fringing on the secondaries is really problematic. It doesn't look too far out of what I see on photos that are verifiably atriceps from the highlands of Peru, Bolivia, and N Argentina.
So I am still leaning towards Dusky-capped but would love to hear more discussion or be shown to be wrong!
Cheers,
Josh