We'll use another theory/instance:
"Smart" Theory:
Regarding the Flood on the Forerunner Shield/Shipyard World; There's absolutely NOTHING to prove that the Flood were contained solely on Installation 04 and the gas mine on Threshold. Therefore one cannot accurately say that the Flood could not possibly have been on the Shield World.
Dumb Theory:
John Forge is John-117's father. John Forge was born on Earth in 2502. John-117 was born on Eridanus II in 2511. There is no possible way that John Forge had any correlation to the Master Chief.
Spartan R41, prepped for combat insertion.www.facebook.com/Spartanr41 (If sending a friend request, please also send your HWF name. Keep in mind a request accept isn't guaranteed.)
Never Forgotten: http://www.youtube.com/watch?v=qGh7JbFQDX4