Our other thought was La Sagra's, which would be even cooler. It did seem a bit smaller so closer to that size.
Travis returned and saw it again this afternoon, but unfortunately an even briefer look. He didn't see the yellow of a gcfl but says it was a poor angle.
If anyone w/ a mega-lens camera and/or more experience w/ flycatchers wants to look for it, we can provide more precise locations of sightings.
Luci, Travis and Michelle