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This is the first image made available to me; note the following features:

• Rich pink legs; when LBBGs have "pink" legs they are actually a dull fleshy tone, often with some dull yellow mixed-in. WEGU legs tend to be less-richly colored than this, but there is some overlap.
• Uneven, "bulbous" crown shape with two peaks; LBBG has a smooth crown that is normally flat; WEGU tends to have a single, smooth peak.
• Obvious, extensive yet sparse streaking on the head, with a small dark smudge around the eye (broader ahead of it), and fairly lightly marked auriculars; LBBG tends to have denser (and sharper) streaking, especially on the auriculars and with a larger patch around the eye; WEGU of this age would be completely or virtually unstreaked.
• Lower neck-sides and chest marked with large, thick, blurry blotches that - on those not in shadow - seem to have a warm component to the tone; LBBG has thinner, cleaner-cut streaks here, and they are cold-toned, not warm toned; WEGU would not have these marks at all.
• Bill with medium gonydal bulge, pale pinkish at the base with pale yellow tip to the maxilla and a pale orange spot on the gonys; blackish smudging perhaps indicates it is not a full adult; LBBG rarely has a pink tone to the bill base on a bird otherwise looking as mature as this one; WEGU would not normally show the pinkish base, and would have a much stronger gonydal bulge.
• Although in shadow, the tone of the back is clearly very dark gray, at least; an LBBG with this dark of a mantle would be one of the forms that is even slimmer and longer-winged than the graellsii and graellsii-intermedius intergrade LBBGs we normally get in North America; this apparent darkness would be at the dark extreme for WEGU.
• Looking at the primary tips, P6 - P9 of the near wing are visible (with P9 of opposite wing just below them) - all large gull taxa have P10 the same legth as, often just shorter than, or rarely just a bit longer than, P9. Thus the wing is probably as long as it is going to get - yet it looks shortish-winged, with the distance from the tip of the tertials to the tip of the tail longer than the distance from the tip of the tail to the tip of the wing - on LBBG this ratio is reversed. WEGU is similar to SBGU in this regard.
• Even from this angle the white tips to the primaries can be seen to be large, and broad; even on older male LBBGs (birds that will have the most white in the primaries) the white apical tips would be largish but narrow - a derivative of the more-pointed tip to their primaries.

The following images have been subsequently provided by various photographers, with permission; note the following extra points:

• The "bushy" tertials with very thick white tips; LBBG lacks the tertial "hump" and has narrower white tertial tips; WEGU shares the tertial humps but averages narrower white tertial tips.
• The distinct slaty tone to the upperparts; LBBG has a leaden tone to the upperparts, while WEGU tends to have a slightly bluer tone.
• The underside of P9 (the longest primary; P10 is not quite fully-grown and is visible as a large white oval a couple of inches back from the tip of P9, on the underside of the opposite wing) is mid-gray, not blackish; LBBG and WEGU have blackish underside to the tips of the outer primaries.
• On the Ohl images, the tone of black/dark on the upperside of the primaries changes from darker to paler from the outer edge to the inner edge - a classic feature of SBGU; LBBG and WEGU have the black of the outermost primaries of a similar dark tone across the entire feather.
• The one difficult shot of the open inner wing suggests a very thick white trailing edge to the secondaries; LBBG has this edge thinner; WEGU averages thinner, but some individuals have white secondary tips as thick as on some SBGUs.

Added Dec 11,2003: Although distant and fuzzy, these images show a classic SBGU underwing:

• Thick white trailing inner edge such that the white tips to the secondaries are so thick that they meet the white underwing greater secondary coverts - with no dark gray intervening - and the inner wing looks all-white.
• The underside of all the visible flight feathers except P10 are medium gray, not blackish or very dark gray as on all other dark-backed gulls; the darker P10 (not quite fully-grown, with large white tip) is a regular feature of SBGU, as shown well in Sibley, and on page 340 of Grant's "GULLS" (2nd. Ed.), and on some of these Japanese SBGUs (click here) .
• Although exaggerated by blur, the white trailing edge of the primaries is thick and extends subterminally to at least P7/P8, with the black terminal tips to P7 - P9 contrasting with the palish gray bases.
• The thick neck/shoulders and wide inner wing create a chunky impression rather than a sleek impression.

Note on these Japanese gulls (click here) that the underside of P10 is not always contrastingly dark, and also note how the white pattern near the tips of the outer primaries (the so-called"string of pearls") is much more visible from below than from above on many SBGUs.