1.Vegas was able to take advantage of some teams who hadn't prepared for the expansion draft as well as they should have. You won't see that happen again. Teams will be better prepared this time around.
2. Vegas brought in some guys who played way better than anyone expected when given bigger roles. That's unlikely to happen again.
3. Vegas, as a team, way overachieved. I wouldn't call it "lightning im a bottle", but something close to that. Vegas should not have been that good with that roster. They haven't repeated that measure of success since, which you would expect if they were really that good.
The likelihood that Seattle repeats any of what Vegas was able to do is small. They won't be a 20 win team, but they won't be a playoff team either.
Totally. I won the lottery once, therefore I should expect to win everytime I play. That's logic.