Kakko
Formerly Chytil
I understand what you meant, which makes the "for free" comment a little confusing.
Callahan has value. Enough where you wouldn't need to add in a conditional 1st for a guy who will not be a part of our long term future plans.
A 1st would have to be added in a package of prospects and young, unproven, players. Not in a captain for captain swap.
A 2nd-3rd line rental does not have as much value as you seem to think