That’s why people have problems with many analytics. Not all analytics, but some. This is a perfect example, why most managers use analytics as informational, more than some sort of guide to building their team.
Ekholm just got done showing everyone he can play the hard minutes Petry has always struggled to play. Petry has always been closer to a Brodie.. he can be, or at least has been able to be, a really good role player, but when you ask him to carry a pair, his bad traits start showing themselves.
Look at the teams who succeed in the playoffs. They have 2-3 dmen who can carry the play, and then the supporting, role playing types to fill the gaps. Ekholm is in that first category, while Petry is in the second.