I mean says who? He could be worse or the same in the playoffs.
There's no magic guarantor that he gets better because some fans like that he has a cool mustache and a cool attitude.
This is a cruel league and survival of the fittest out here, every opponent especially in the playoffs is going to be looking eat Skinner alive, does he have the game, does he have the mentality, does he have the coaching (ahem Schwartz), does he have the defensive system in front of him?
The other question is do the Oilers even have the time here to entertain these questions to begin with? Because if the answer to any of the above is no, the cost probably is you just wasted another year of McDrai's prime needing to find that out.