Ya, a healthy Tanguay makes a huge difference for this team. He's still a big time gamer, could put up 60+ points playing with Landy and Mack.
Wouldn't be surprised if Roy doesn't try Iggy and Tangs together at some point though. They have fantastic chemistry together.
Landy - Duchene - ROR
Tanguay - Mack - Iggy
At some point I think that could work, couple guys on there off wings but a Powerforward and a strong playmaker on both lines.
As for the bottom 6, IMO Ginner Briere and Talbot will make up that line. Briere still makes a decent game at Center, so I think they keep him there and move Malkin either to 4C or 3RW and move Talbot to the 4th line.
McGinn - Briere - Malkin
McCleod - Winchester - Talbot.