Nothing against Stepan, but VAN should be closer to full on tear it down, rebuild mode than adding guys like Stepan.
The sedins are on their way out (performance and/or contract wise) in the next two years.
Stepan, while not old by any means at 26, is just not the right age if VAN hasnt even begun to accept the rebuild process. He isnt a good enough player to turn around the VAN dumpster fire right now as there are far bigger and more issues than he can even chip away at.
If you also believe VAN might wait a year or two to fully accept a rebuild and tear it down, Stepan has 4 years left on his deal after this year. By the time VAN tears it down, and builds it back up (if they do it right) to any type of serious contender Stepan will be likely gone or a pending UFA.
Its just not at all a good fit, more for VANs situation than Stepans fit with the team
VAN should be targeting guys no older than 23 or quality picks/prospects