The fifth link down shows the bird stretching its wings. Unfortunately
the upperside is not clearly visible and only one tip of a greater
secondary covert is showing (it does look like thick white edging
though). I haven't seen it mentioned yet but the UNDERwing of the
Limantour bird shows brown-washed primary coverts and white secondary
coverts. The secondary coverts are overexposed but regardless there
does not seem to be any detectable brown wash there.
Hayman/Marchant/Prater mention this difference but the illustration
isn't very good. Looking at the Slater Museum of Natural History wing
photo collection the difference is much more obvious with Long-toed
showing a brown wash all the way down the secondary coverts
(admittedly the collection does not have a hatch-year Long-toed wing).