I always figured it wasn't always the same hand-- it became the Anti-Monitor's hand or Hal's hand when they were trying to remake things. But only temporarily-- if you can use that term where time travel is concerned. The rest of the time, it's the hand of God or whatever. Basically, whoever is trying to take over the multiverse gets to say "talk to the hand." Finally! That explains it! I want to hear Guy's explanation of why the Inhumans wear masks even though they don't have secret identities.