Well mediocre was a bit harsh, I mean not elite. Kings still finished 13th overall last year and 7th this year. Of course any above average/good team can win the Cup, I never denied that because the proof is simply there.
I just would like to see which teams (finishing between 7th and 13th place) had any kind of playoff success for consecutive years.
It's hard to find any teams outside of a handful that have had success for more than 1 or 2 years. Here are a few:
Detroit went Championship/SCF/2nd round. They were fantastic in the regular season, finishing 1, 3, and 6.
Pittsburgh went SCF/Championship/2nd round over the same span. T5, 7, and T8.
Boston from 09-11 went 2nd/2nd/Championship, finishing 2, 14th, and T8.
Philadelphia from 08-12 went 3rd/1st/SCF/2nd/2nd, finishing T10, 8th, 18th, 4th, 4th.
San Jose had a great run since the lockout, going 2nd/2nd/2nd/1st/3rd/3rd/1st. Over that span, they've finished 10th, 5th, 2nd, 2nd, 2nd, 5th, and 12th.
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What's interesting, is that only Detroit won the cup when they had their best regular season finish.
Pittsburgh never finished higher than 5th.
Boston was all over the place, winning the cup when they finished 8th overall.
Over their pretty good run Philly's average overall position was 9th, and their two best playoff years they finished 10th and 18th.
San Jose has been a regular season beast since the lockout, but have never gotten to the final.
Detroit and San Jose are the only two teams that have had consistent success in the playoffs and regular season since the lockout, HM to Pittsburgh.
What I find most fascinating is that recent cup winners tend to be outside the top 5 teams in the league, all but one finished 7th and beyond. 2006-2009 still had top 5 teams winning, but remember there was a salary rollback and those teams could still hang on to their high-priced squads for a couple years until they had to start bringing in new players.