1) IMO this is the most plausible explanation of recent inflows to 1HtUGfbDcMzTeHWx2Dbgnhc6kYnj1Hp24i:
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The answer to "why not all at once?" is: Because they don't want to manually log into all accounts every week/month and dump coins into the mining distribution wallet.
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So really, there's nothing to suggest hidden hash power at BTC Guild, and this was not an attempt at share price manipulation.
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2) I don't think the above implicates imminent dividends. Before September there was a transaction of around 51btc and ... we are still waiting.
3) I'm convinced AM has more hashrate outside BtcGuild - net income is probably used/stashed for production/deployment/development.