Mystery Warbler – Nashville, VIrginia's, or other? Please advise.

Myriad Lazuli Bunting and Western Tanagers were hanging on at Marston Canyon Wednesday. Alison Davies and I had one warbler we couldn't identify. See the first two images at https://www.flickr.com/photos/78690481@N07/. (You'll have to zoom in.)
Is this just the world's rattiest-looking Nashville, or something more interesting (like a Virginia's)? Opinions/guesses/enlightenment appreciated.

Caron Andregg
Hillcrest
Source: SanDiegoRegionBirding Latest Reports