Bottom 6 players are MUCH easier to find in the free agent market over top 6 forwards, and reliable defenseman. Not the slightest bit worried about losing Fast. We will find a replacement.
Tough to say. The good bottom six players are overpaid just like the top six guys. I mean that's the reason we're afraid to sign Fast, right? Because he's going to be overpaid? So instead we sign someone else's guy and overpay him?
The alternative of course is taking guys off the scrap heap and hoping it works out. And sometimes it does--you get Moore, or Pouliot, or Fedotenko. But you can also get a big bag of suck like Pirri, Halpern, Stalberg, Stoll, Jooris, etc. Or you can go the trade/waiver route, which has given us so many terrible players for 20 games or so each that I don't even know where to start.
Anyway, just saying, it's difficult to built a quality bottom six if you're going to rely on external guys. The really good ones, you have to pay for it. And if you want to go a tier below to the guys who could be good and are also cheap, it's a big gamble and you may end up with a bunch of shit on your bottom six.
If Fast's price is reasonable I think he's a no-brainer.