McDavid is worth way more than that. And anyone saying they wouldn't trade Slavin for McDavid is out of their minds.
As a Knights fan who saw his team win a cup last season, i would trade anyone of ours players for McDavid. Having said that though, even i will admit that none of our players or prospects would bring back a McDavid no matter how many different combinations Vegas tried to use to get him.
Winning the cup takes a team effort. It is not McDavids fault that he is surrounded by mediocre players.
I would be willing to bet money that if you replaced McDavid with Eichel last season during the playoffs, Vegas would still probably win the cup.