The only conversation worth having about a trade involving Colton Parayko is a trade that returns a #1C.
The Blues don't need to move him, at all.
He is coveted around the league because other teams recognize his ability.
Edmonton is really the only team that has a spare #1C to trade, if they were so inclined.
CP55 is a #2D in the same sense that Leon Draisatl is a #2C--i.e., both clubs have the luxury of having redundant players on their roster. Both fan bases love the talent and potential of these extra pieces. If Alex Pietrangelo were to retire tomorrow, Parayko would be the Blues #1RHD no matter who else we brought in.
There is a hockey deal to be made between these two clubs.
It may not happen, and in fact it most likely will not.
But if it did, both clubs would be better off for it.
Recognition of that fact is why the idea keeps popping up again and again.
In spite of the bad taste it leaves in our mouths, it makes sense on some level.
None of which is to suggest that their value is equal.
In any event, Colton IS a RHD--so why would we be wanting one back if we were dealing him? Why downgrade? And our position of need is Center, not wing. The Blues are not the least bit interested in trading Parayko, unless it's a stupid deal that just can't be refused, or the #1C we need. Draisatl is that guy. And if he is a #1C, then Parayko is a #1D.
As for what he's done for the Blues, he stepped in and gave them solid, reliable defense as a rookie, and played the game his coach asked him to play. Any woes the Blues had in the last two seasons are entirely attributable to goal scoring and goal tending, not the defense.