You way overvalue the location of faceoffs. Most shifts are taken on the fly.
Depends on the player.
Nat Stat says McLeod had 7 5v5 on the fly shifts last night. But he had 8 shifts start with a faceoff, 5 of which were in the D-zone.
Smith started 4 shifts on the fly, while 8 started via a faceoff. (kind of surprisingly he started 3 in the o-zone, not sure what that combination says.)
Even Nico, 11 shifts started via faceoff (7 of which were o-zone) while he had only 7 on the fly shifts.
Conversely Hughes had 14 on the fly shift starts, and started 7 shifts via faceoff, none of which were in the d-zone.
So yeah, for certain guys, who you don't want taking faceoffs, like Hughes, they start most shifts on the fly(and their linemates usage is obviously going to be affected by this as well), and will rarely start a shift on a d-zone faceoff, but for guys who are good at faceoffs, they will start a much larger % of their shifts off a faceoff, and a guys used in defensive roles will start signicant portion of their shifts on a d-zone draw.
And the bad faceoff/defensive guys won't stay on the ice if early in their shift there is a d-zone draw, while the good faceoff/defensive guys will, which amplifies the effect.
The usage difference between Hughes and McLeod for instance is huge. As we would expect given the skillsets of each, but that usage absolutely has an effect on their respective #'s.