You can't build a team where if everyone gets hurt you'll be fine. Any team would suffer when two top 4 dmen are out with injury, including the Ducks that you keep ignoring.
And why temporarily put a young promising player into a role that could allow him to grow and show the team what they could potentially have in the near future and allow the possibility of him replacing these older veterans once we need to shed ourselves of their cap? Yeah, why would we ever want to do that.
Also, keep in mind that we will not constantly be playing teams as good as Anaheim. We should be able to agree that Anaheim last year was a cup contender. So to say they exploited a rookie bottom pairing dman in a 7 game series isn't the same thing as a rookie dman leading to constant losses against teams that are not nearly as good as Anaheim. We're going to beat up on weaker teams too. If your argument is that we won't be able to beat the contenders, which we did a lot of last year, then that still is terrible reasoning to be worried since we don't need to contend with them until April. Your logic has more holes in it than your version of our team.
To extend on this. Say Sekera is out till December. These are the teams we face...
Calgary
Vancouver
Winnipeg
Ottawa
Carolina
Chicago
Philly
Pitts
Dallas
Washington
Pitts
New Jersey
Detroit
Islanders
New Jersey
Rangers
Washington
Vegas
St Louis
Detroit
Buffalo
Boston
Arizona
Toronto
16 games against the Eastern Conference
4 inter division games
11 games against playoff teams from last year
13 games against teams who missed last year.
If we only go 0.500 in those games we would still be in a good spot as most of the games that matter most (Inter conference and inter divisional games) haven't been played yet. Hell, say he is gone till Christmas
Calgary
Philly
Montreal
Toronto
Columbus
Nashville
Minnesota
San Jose
St Louis
Montreal
5 games against the east
1 inter division game
9 games against last years playoff teams
1 against teams that missed
Even those games aren't that dangerous.
Our schedule makes missing Sekera a lot more digestable which is probably why Chia isn't too worried at the moment.