All this speculation, all these theories, me with my half-baked English: What the fuck is going on!
TLDR: All the speculation and theories boil down to this - we're passing time between updates trying to work out wtf is going on.

Ocean has a habit of adding importan details where they don't seem important so we're trying hard to find all the connections, and in somecases we think we've discovered bigfoot, in others, the Loch Ness monster, and in others we've discovered that Summer is a an alien vampire and she's gone because, well sunlight. Don't take us too seriously, sometimes our own theories are just hot air or bad new year's humour.
Who's William, by the way?
Willi is the protagonist in Ocean's other game Where It All Began. Link to the thread is on the first page of this thread. WiaB is the first game in Ocean's series, SG is 20 years later, roughly. Some of SG is easter eggs for people who know WiaB, and it makes some of the characters backstories more interesting to know their past. It's also the source of all the conspiracies, because it's literally where it all began.