Two cap dumps would prolly be one late round pick 5-7. Although I guess some people think that hagelin still has value so I'll go with that. Hunwick on the other hand is about as useful as clothes in an orgy. So he is definitely a cap dump. The trade is not unreasonable if that's what you're asking.

3×3 should be fine for rust

I know it is hard sometimes to see the intrinsic value of a player, but Hagelin is the player that Botterill would like to have. He kills penalties and has 2 Stanley cup rings. I would think he could return more than a couple of fourths so I think it is a good trade.
Let's make a deal

After this trade, Calgary is still looking for a top RW...

Pittsburgh's history is filled with guys whose numbers regress after leaving Crosby and Malkin. I don't see anything in Sheary's game to indicate he is the exception.

I think Hagelin have some value great on pk can play on top 6 is he good that is different question his salary should be around 2.75-3 mill so is he over paid yes if he was making 2 mill a year I think his value would be 2nd. So that is why a 4th if pens took a 5th I would be K with it.

Now Sheary to Calgary when plays with Jake and Crosby he fits in it will be a gamble for Calgary but can see it pay off now the trade for one of there d would not be 1-1 so pens would have to add now would Calgary do Sheary rust and 2nd for one of there young d? Would the pens do it and should. If the pens free up 4m for hag 3m for Sheary and don't have give rust a raise that is a 10m saving then pens sign jvr 6x6 plus cap goes up 3-7m

Lines could look like

Jake Crosby horny
Zar geno Sprong
Jvr brass Kessel
?/simmion sheahan kun/rowney

That top 9 look great could switch jvr/zar may be even better line.