Value is off. Monahan is worth more. There are no substantial pieces coming back to calgary. There is no reason for flames to make this trade
All 3 players are ready to play in the NHL. Roslovic would fit right into the 2nd line at center or RW. Niku is a promising top 4 Dman. Poolman is a potential 2nd or 3rd line pairing, maybe even with his brother Colton someday.