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Take into consideration the innovation: a short glottal has been added because people wanted to case it like other letters. They might have made another typographic choice: they might have innovated a wide capital to distinguish it from the "lowercase tall" letter. But they didn't.
Height is a (the?) recognized distinction between upper and lower case. Width isn't. So a "wide capital" wouldn't be the most intuitive choice.
But there is a precedent for this choice. When the Latin h was borrowed into Cyrillic (U+04BB, borrowed c. 1940 for languages which were forced to change from Latin to Cyrillic orthography at short notice), the lower case glyph was borrowed unchanged complete with ascender. But the upper case shape H was already in use for the sound n (U+041D), and so a new upper case glyph had to be invented. The shape chosen, U+04BA, was essentially a wide variant of h with upper case serifs (conveniently also an inverted U+0427).
-- Peter Kirk [EMAIL PROTECTED] (personal) [EMAIL PROTECTED] (work) http://www.qaya.org/
