Kings lack depth in the top 6.If Kopi goes down Jeff would've to cover for him.If Brown goes down then Gabby would probably cover him.But then who replaces Carter at the number 2 center?Shore Not during the playoffs.Then who replaces Toffoli or Pearson if they went down?No one.The team can't suffer a Doughty injury or Muzzin going down.Kings are not as deep as most assume.
You can say that about literally any top center.
Parity is close enough in this league that any team losing those kinds of players will be hurt. Some less than others, sure, but you don't 'replace' Carter. Kempe has been admirable enough.
Everyone cites the Ducks as an example of a team succeeding despite injuries but they have the third worst goal differential in the west and are second to last by points percentage. You can only go so long this way.
You can always
improve your team which I agree with, but as Fishhead said, in the cap era, everyone has holes. I don't think this roster is fundamentally flawed given they're 7th in the entire league in points percentage after missing Carter and Gaborik for most of the year. We're going to be sitting players who have played very well (Brodzinski, Mitchell, for example).