Jigsaw was lying on the table when Detective Strahm got the door shut on him. And no, the two fat guys were not the same. Since they both died. one with the dude beating him, and the other by getting his arms and legs pulled off. TECHNICALLY, Jigsaw is alive in the fourth one, since it is happening as the same time as the third one. But the beginning of the movie is the latest seen from Saw. That is the most current seen. Anything that happened after that was happening when saw 3 was happening.