I don't even understand Saw. Didn't the main villain die like 3 movies back?
Jigsaw lived at the end of Saw I, but was supposed to be dying at the end of II.
In III he turns out to be not dead but is apparently dying and training his protege Amanda. They both die at the end.
At the start of IV they find his body but there is a tape in the stomach hence he manages to be in that one too.
By V they had given up even trying to come up with ways to keep Jigsaw in it and another protege, Hoffman takes over.
Same in VI.
Apparently two more are being written. I have no idea why, they really are flogging a dead horse now. Nobody gives a shit about Jigsaw, he was a shit character anyway.