MacGillivray's Warbler with nearly complete eye ring on one side

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I spotted this MacGillivray's Warbler this afternoon at Frontera Audubon Nature Preserve. While it looks essentially like a female MacGillivray's, on close inspection it shows an almost complete eye on the right of it's eye. In researching this I found that the Stokes Birding blog notes, "Young MacGillivray's Warblers would have thick, white eye crescents which may, in rare instances, form a nearly complete eye-ring." So I suspect this is a subadult MacGillivray's unless I feedback to the contrary. Do click on this pic to enlarge it to see how almost complete the eye ring is.
Unfortunately this is the only other pic that of this bird. SeEtta

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