Is what possible

I forgot to complete the trade

That's what the Habs said when they traded Roy to Colorado.

Poirier, 22 2nd= Monahan cap dump - NO
Zary, 23 1st, Pelletier= Bert - NO
23 2nd= Namestnikov - Maybe
24 4th= Stecher - Yes

Flames won't need to pay to trade Monahan, not yet at least. He's still serviceable and to say we would need to give a top 10 prospect and a 2nd to move him is just insane. So no, that's not happening.
Bertuzzi is a good player, but I don't think he's worth two top 5 prospects and a 1st. That seems like a massive overpayment especially with only one year left on his contract. Add to that, the Flames are strapped for cap space next season and will need Pelletier (and another rookie) to make the NHL so they can pay Gaudreau and Tkachuk, that's an easy no.
If we move Monahan, we could take Namestnikov.
I think that's fine for Stecher.