IMO, the cost isn't directly tied to the most future value that can be attained. That's not how Benning works. He targets pieces, first and foremost. That's been his M.O. Rarely, do you see him target picks and lesser prospects. In other words, he doesn't sell, he trades.
This is rather frustrating to Canucks fans. A 1st + B prospect is a good base. Not to JB. He targets and then he waits, just as he had done with Leivo.
Another quirk here is that he not only targets the player, but he targets the vacating position. For example, when attempting to move Gudbranson, he targeted Demers as the return -- another right shot Dman.
Mike Halford (local radio host) tells a story about his conversation with Benning about trading Tanev. Benning's response to the question "well, we would need another Dman back". Halford retorted "you're planning for years out, and you could get a dman elsewhere". Benning again responds with "I think we're going to need a dman back". [paraphrasing] (Last week's radio hit with Botchford)
Long way around, I interpret this to mean that he will target another right shot dman from the trading team. If he gets this player, he makes the trade. If not, he holds onto Tanev. In the case of TOR, I have to think that this player is Liljegren, if anyone. That's where it starts and stops with Benning, IMO.
What's the sample size of this?
Also, do you have the QualComp/QualTeam numbers handy?