[BFritz]

Dr.Gordan is alive IMO. How else would they get all the medical supplies needed to keep Jigsaw alive?
Also, something else to consider is this. Maybe we haven't actually "met" Jigsaw yet. Maybe Tobin Bell was playing the game all along, like Zet in the first one, and Amanda in this one, we had no idea they were playing games. I mean, what was up with those flashbacks he had of him telling the blonde lady he loved her?

I think that the lady doctor he had kidnapped just reminded him of his wife, that's why he was having flashbacks. I don't know about the first part, because he takes responsibility for all the killings, and you see him committing them in his flashbacks.