I think you are over exaggerating his complaints. I do think it's unlikely he stays at this point, but there's a lot of season ahead and he certainly can't complain about his usage right now. If Pens are successful with him here, I could see him wanting to stay.
I'm not crazy about giving another long term extension to a dude over 30, but I'm REALLY not crazy about paying Sheahan 3-4MM to be the 3C. I'm sure I'm too harsh with him, but I just don't like the player. He definitely he can be effective, but a lot of the time he's so blah.
Well we know they were real, and we know he's currently playing on the wing... so I'm not so sure about that...
That's going to go for most guys in the 3-4m range. We got spoiled by Bonino and HBK's hot streak that was never repeatable. But most of the centers who will make 3-4m are not going to be guys anywhere close to Brassard's caliber. And the few that are, are guys on amazing contracts and/or are vastly out performing those contracts.