These are pictures of three different empids I saw all in the same vicinity. One is a juvenile (the last two pics), and was associated with the second adult pictured. Least and willow flycatchers have been the most recently seen empids, according to eBird, but acadian is also a possibility. I was pretty sure I heard the song of a least, but I am not very familiar with eastern flycatchers' vocalizations, as I live in California.
Continuing. 3 males, 2 females. Photos forthcoming.