It's not impossible to succeed in that usage, though. Brandon Bollig has the most defensive starts in the league and is still running a positive differential.
No forward with under 35% ozone starts has a positive Corsi Relative.
Bollig has a positive shot differential, but is by far on the worst line in terms of shot differential on the team.
Of all players with under 40% ozone start, that Chicago line has the only 3 players in the NHL with more than 20 games and a positive differential.
Stats for enjoyment:
(season), (Total Players with 20+ gp, <40%ozone starts), (with positive Corsi), (Have positive Corsi Relative)
13-14 39-3-3
12-13 41-7-10
11-12 35-2-3
10-11 31-4-3
--------------
Total 146-16-19.
So of the 146 player-seasons that've been assigned primarily defensive roles by their coach, only 16 have had a positive shot differential. Only 19 have been above the team average.
Now to draw a conclusion:
1) Coaches stick their weaker defensive players in the defensive zone the majority of the time, as is evidenced by people who always start predominantly in the dzone having bad shot differential numbers compared to the rest of the NHL and their teammates.
Or...
2) You're underestimating the effect of the extreme zone starts to an absurd degree. And the idea of comparing Malholtra to "the rest of the NHL" or "The other hurricane forwards" is non-sensical from a statistical perspective.
I know we're belaboring a point here, but it's an important (relative to inane hockey discussions
)one. Particularly with the amount that "Shot differential" gets thrown around as the holy grail of advanced thinking on hockey.