The warbler is indeed very odd. The streaking could be caused by odd hormones that resulted in juvenile characteristics being retained in formative plumage or be a result of hybridization. Since the gray extends across the chest, I don’t think it can be an OCWA. In several respects, the bird looks more similar to a Macgillvray’s, but they should show pink legs and, of course, lack streaking.
From: <sbcobirding...> [mailto:<sbcobirding...>] On Behalf Of <thorntonmlt...> [sbcobirding]
Sent: Thursday, September 07, 2017 3:39 PM
Subject: [EXTERNAL] [sbcobirding] Newport and Coronado
We paid brief visits to the Newport crossing and the Coronado Seep this morning. Newport was not very birdy, but what we took to be a dove turned out to be a White-tailed Kite when we looked at the picture, so that seemed a bit unusual.
At Coronado there were only a couple of warblers, a first year Wilson's and what we took to be an Orange-crowned Warbler. The Orange-crowned seemed unusual in that the head was mostly gray and the breast was flecked with little black streaks. A picture of the warbler is on the checklist: