Habs Icing
Formerly Onice
That's why you add a top6 player at the deadline as a rental or you make a hockey trade in January / February to upgrade your top 6. Signing two top 6 UFAs is an easy way to cripple our cap situation for a long time.
Signing one of Eriksson, Luc, Boedker, etc. would be enough.
If you get what you need now you're prepared for what will happen during the Year. Say an injury. You only need to get the one.
If you only get one at the beginning and there's an injury, you're back to needing two pieces.