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Best viewed wth monitor set to 1024 pixels width.

This "white-winged" gull was photographed at Corpus Christi Landfill on March 20, 2004 by Martin Reid and Willie Sekula:

it was the size of a small HERG, and quite daintly-looking, due to the rounded head and delicate bill:

A most confusing bird for me; here's my initial thoughts:-
Not a GLGU (many things wrong); nor a pure ICGU (structure, tail pattern, etc.), nor a normal HERG that has faded/worn (too much pale tones in coverts and retrices; markings in greater coverts too irregular; subtle subterminal mottling in some retrices.)
Leucistic HERG?: maybe, but the degree of patterning in all the feathers does not look right for such a creature, I feel.)
Nelson's Gull (GLGUxsmith HERG)?: should have a cleaner bicolored bill, more obvious whitish eye-crescents, more barring in the tail base, plus the bill size and overall size look too dainty for this combo?
GLGUxGWGU?: not large enough or chunky enough, and too much dark in primaries?
GWGUxHERG?: not large enough or chunky enough, and wings too pale - although the rather short-winged look and almost-plain tail suggest this combo?
HERGxTHGU?: Structure may fit, but flight feathers look too pale for this combo?
HERGxICGU?: in some ways this seems the best fit (size, structure, paleness, tail pattern) - but do such hybrids exist? most range maps show smith HERG meeting kumlieni in southern Baffin Island - ???
THGUxICGU?: seems too large and chunky (but bill shape okay?), and the almost-plain tail seems wrong?
addendum, March 25:
THGU?: this has been suggested, yet I wonder if a pure THGU ever shows this extent of marbling on the greater wing coverts, lower scaps, and retrices (see iamges below) ?

Update: March 25: Here's a new image from March 20:

- on the crop below, note the marbled pattern in the arrowed feather, plus the large number of 2nd-generation scapulars:

and here's a couple of pics by Willie Sekula from March 24:

note below the fine marbling in the distal outer web of each retrix: