Aww shit you made me remember all about Eric Matthews, I felt so bad for the poor guy when he died in Saw IV just because Rigg couldn't follow Jigsaw's message of his obsession with trying to save everyone. Jigsaw kept that dude alive and trapped for six months, just so he could be part of Rigg's game, and then die by those blocks of ice.
Yeah that twist was pretty cool too, and it's very similar to the twist of Saw V, Special Agent Straum being too arrogant to listen to Hoffman's tape so he becomes a bloody pancake in that compactor room.