To some degree I also just think that some players and people aren't built to bring 100% every night. In reality, no one is; even the most consistent are more along the lines of 85-100% every night. But some people are more along the lines of 30% some nights and 130% other nights. Lots of guys trend toward the other side, some examples would be say Kovalev, Nash, Mike Smith, Vanek, Duchene, Perron, Franzen, Saad, Kadri, Zucker, Dubois, Benn, Silfverberg, Marchand, Mike Richards, Kreider etc. None of those guys I'd say are particularly lazy (In fact most on this list are considered to be hard working "play the right way" always engaged players), but all of them have or had a tendency to light the world on fire sometimes and sometimes not even play the puck on a given night.
Even perfect beacons of consistency like say a Smyth sometimes just had bad games, or even bad strings of games.
As far as I'm concerned, you dont need Khaira to be lighting the world on fire every night. But he needs to be better at making sure his low points are extended low points.