Its interesting because Staal is the type of player the Sharks need and Setoguchi is the type of player the Pens need. Of course with Marleau breaking through defensively the Sharks might not need him as much.
Can we please stop with this "Staal is the catalyst to winning the Cup" attitude? It's a fallacy if I've ever heard one.
If you prove it. Our third line turned around the SCF for us. Staal's shorty was a big difference, too. I can give you multiple times where his line/pking ability single handedly pushed us over the edge.
I'd do Goligoski+3rd for Setoguchi. But Staal is generally speaking rather useless to us. We're very deep at center and don't really need another one. (If all our FAs re-sign, we'd have Thornton, Marleau, Pavelski, Mitchell, Malhotra, Nichol and likely an NHL-ready Couture that could play center.) On the other hand, a top 4 dman would be good to replace Blake.