Hey, Widowmaker and Logos. Sorry, I've been out of town, and in the meantime I finally got an answer on the moult question from an expert, which carries some new information for both of us, I think-- he took a look at the image and yes, he agrees with your Eastern Pewee. I quote:
"The empids that have bills that long and wide, Alder/
Willow/ Acadian, do not have 1/3 of the lower mandible
dark tipped (occasionally have very end dusky) but
Eastern Wood-Pewee does. The gap seems fleshy enough
to indicate a juvenile? Of these 3 species and
wood-pewee, only Acadian molts within USA before
migrating. All of these 4 species USUALLY have buff
wing bars as juveniles, and all 4 species have these
until spring. However, juvenile wood-pewees can have
bright white wing-bars but usually the upper is not as
wide as the lower. Only wood-pewees have white fringed
lesser coverts especially as juvenile; empids are grey
(adult)or buff (juvenile). All adults except Acadian
Flycatcher should be highly worn by September and on
empids this means that the breasts should be very
plain without the high contrasting "vest" and
yellowish vent, flanks and lower belly displayed by this
individual (very pewee-like), and wing bars reduced and
showing wear. The exception would be Acadian, of course,
which in fresh plumage should have a complete slightly
yellowish eye-ring and more distinct pale lores and
less "vested" appearance. Adult wood-pewees in
particular would have very little wing-bars left and
these would not be pure white (adults in fresh plumage
are usually off-white). The most common of these
species in the east during Sept is Eastern Wood-Pewee.
All 4 species can have little or no eye-ring but the
almost totally dark lores would be well-worn adult
empid or pewee. As stated, a well-worn adult empid
would be plain breasted. (However, spring Willows can
be quite dark on the lores). I cannot see the
"smudges" on undertail coverts of pewee, but these can
be difficult to see especially at the given angle. The
throat is very white for pewee. The head shape looks
pewee and the overall length (even with back end
chopped off) looks longish (pewee-like). I believe it is a juvenile Eastern Wood-Pewee."
I stand corrected!