The fact is, all data can tell you something - it is the pieces that you correctly identify or mis-identify that showcase hits or misses.
If we were to take Kessel's -18 as the only stat that we were to use, we would trade him right away. But, there may be other components that relay the opposite message (effective zone entrances/exits, etc.).
There are some stats that explain a measurable that someone either worries or doesn't worry about. Using Kessel as an example again, let's say that his zone entry percentage is great, but his shooting percentage is floundering. Well, that is less of a worry for me, because he is helping to get the offense into the zone, but his shots are being stopped. Could mean he simply needs to get into better angles for shots. That's an example of two stats working together to shape the story that while Kessel has not been good, that is more attributed to a lack of production in goals only, and not because of some of the other potential reasons to help the team maintain time in the offensive zone.
I also think that Chayka's metrics and analytics are far more based on things like location on ice, positioning, and reaction. If you lose the puck, do you turn on a dime, float in to the turn, turn the wrong direction, etc.? If you show the proper foundational techniques, then we have a little more to work with and we can have an idea of how that player will back-check and what sort of involvement they find themselves in. Obviously, there is also time to understand the proper reads, outlets, etc.
I look at it like a poker hand - sometimes, you make the poor play from preflop through river but still wind up winning. I would be more concerned with finding the player who makes the right decisions through all avenues and just gets unlucky on the river. Those players are going to consistently find ways to be a stronger player, even if the result doesn't become a positive. In other words, don't show a 5 second snippet of awesome goals in the O zone only. Show me the entire 55 second shift and what that player did to get to that goal. Did he position himself properly defensively and maintain effective spacing on offense? Did he find the soft spot of the defense? Did he make the play after doing something poorly, and can that poor decision be fixed effectively? Don't just show all 5 cards and the end of the play - show me the action pre-flop, flop, turn, and river to get there.