It's interesting that you see that they have no talent on the power play. When I watched them it's been MacKinnon, Duchene, Landeskog, Barrie and Rantenen. If there's no talent then why does this thread contain so many posts about how valuable the first four are?
I didn't say "no talent", but (a) it's not on the level of some of the talent other teams play with and (b) you seem to ignore that guys can have off years. Rantanen is good, but in his first season and not exactly an elite talent yet. Landeskog and MacKinnon and Duchene had poor seasons on the PP. If you don't think that type of stuff affects point totals, then I don't know what to tell you.
People can't have it both ways; either each of these guys are worth a lot because they are so talented or they aren't worth much because they are bad players. Which is it?
Do you really think it's that black and white and do you really base players worth off of 1 season? I know GM's don't. Guys have off years, especially on bad teams, it happens. Jeff Skinner, from my team, is a perfect example. 2 years ago, people were saying he was worthless because he had 18 goals, 31 points. We Canes fans were trying to tell people that it was just a bad season as he had 33Goals the season prior, but no, people only wanted to focus on "31 points for $6M" and calling him a cap dump. The team improved and Skinner bounced back. To GM's, one bad season doesn't significantly decrease the value of a player and IMO, that's the case with Duchene.
If he has another bad season, then sure, but right now, I think GMs look at the mess of a team he was on, the circumstances, etc..and don't see a guy who's value has dropped much, if at all.