One skater is never the difference between a great team and a poor team.
It isn't just one skater. You need to remember that. It's Fowler and Bieksa. Playing in key situations.
Here we have a good coach in Boudreau. This is pretty universally acknowledged. His faults aside, almost everyone can agree he is a good coach. That good coach has consistently had lots of success in the regular season, and that same coach used Bieksa and Fowler in a top pairing role. On top of that, not only did he use them in that role, but he
continued to be successful. The team continued to be successful.
Which brings me to my next point: No one has yet explained how a team can have a top pairing of scrubs, and still manage to be one of the better teams in the NHL. From what I've seen, that point has been ignored again, and again. It's easy to say "well, one player can't change that" but that really isn't the whole story, is it? Can anyone show me a successful team that relied on a top pairing that was so, seemingly, substandard? And then, if you can find that team, show me that their success wasn't due, primarily, because they were just
that good elsewhere. A team scoring at the highest rate in the NHL might be able to get away with it. A team leaning almost entirely on goaltending might be able to manage that. Maybe. Anaheim doesn't fall into either category. A team can get away with having one questionable defenseman on a pairing, in a prominent role. That was Bieksa. A team can't get away with having their entire top pairing questionable. You can't give two poor defensemen the biggest responsibilities, and still expect a team to be successful.
Here's where all these individual metrics fall short: The results. Fowler has consistently played with 3rd pairing quality defensemen, and in key roles, and his team has consistently found success. Boudreau might not be infallible, but it stretches belief that he'd continue to play such a questionable D pairing so much if they were dragging the team down. The evidence, that he didn't do that, suggests that he was happy with the results, and those results nvolved the Ducks winning games.