Once again his current value is zero. You are trying to make a case for something that doesn't exist. GMs don't trade for injured players.
When did Nisky ever prove he was a viable top four guy? Spot duty last season and a few games this year? We aren't talking about a veteran top four guy here. Given his potential upside, it is pretty easy to see how Despres playing well in the next several weeks could skyrocket his value over Nisky.
By the time he is back his injury could hamper him and hurt his trade value, Despres may have his spot in the top four locked down or he may be back on the bench.
A whole lot of ifs, which is all we have to go on because Nisky's "current value" does not exist, like you just claimed it did.
He's a top 4 D-man on the pens before the injury, now, and after he comes back. Now if Despres passes him up and only then is he worth more.
One is and one is riding your, if. When he does I'll surely admit it.
It's all the same theory like when Sid went down, and all of a sudden he loses his best in the world tag because of an injury.
Give me a break. Top 4 is top 4. His value won't change, now Despres can escalate his, but he's far less proven, and has yet to prove your point yet. He actually has to put that time in and prove he's a permanent top 4 D-man, and even then Niskanen is still worth more.
One game against a inferior foe at the moment doesn't prove this.
Some one does have a track record in the NHL and in the top 4. You discount his time in Dallas, and he does have 375 games played. Experience. That's between 150 and 200 games in the top 4. Despres has had enough to count on one hand.
Plain and simple, Shero is not getting a proven NHL talent with Despres alone. This thread was made while Niskanen was healthy and it's still true to form now even with the injury. No duh, a GM won't trade for an injured player. Unless he's coming back from some disconfigurement that will keep his ankle from preforming, (meaning he shouldn't be back yet) his value will not change. He has the luxury to prove he's not a top 4 anymore, not that he is one.