There's a lot more skill in Seattle for sure, but I don't think that it's going to translate to team success, at least as far as winning the division.
Defense is horrible. Adam Larsson can't be your best dman, and just like Montreal who is taking crap from everyone, Seattle doesn't have a top 3D caliber dman for a puck moving role. Dunn is decent, but at least so far he hasn't been able to hit that level. Seattle was one of the few teams last year without a 50 point dman (pretty much everyone in the same boat missed the playoffs), and they weren't even close to having one. On top of that, someone will always play too many minutes as their depth isn't great.
Grubauer may be better than last year and still have mediocre stats. That's how bad it was and with basically the same defense, I can't see their relationship changing drastically.
The young kids up front are exciting but even if they put up respectable stats, they're still just 18-19 yr olds who haven't polished their overall game at this level. Add in people like Burakovsky and Bjorkstrand who are more offensive minded, and I don't think the forward group is going to change the culture from last year as far as keeping the puck out.
Also at the end of the day, they lack the top-end difference makers right now, whether it's forward defense or goal.
Likely a better record, but still going to have some issues becoming a winning team on a consistent basis I think.