I would be surprised if those shots had not been at close range. That seems very logical from what we've seen of the fighting on board which was in close quarters. So the violent Jihadis who stated their intentions of becoming martyrs were 45cm away when they were shot in self defense? Would that put them close enough to the IDF soldiers to, say, hit them with metal rods or stab them with knives?
That's consistent with what we've seen in the footage so far:
YouTube - Close-Up Footage of Mavi Marmara Passengers Attacking IDF Soldiers (With Sound)
And also, some of the 'peace activists' were wearing bullet proof vests:
We can argue about the wisdom of landing forces on that ship, and even the need to use deadly force in the face of such vicious attacks by a well trained bunch of Jihadist terrorists on the Marmara, but let's not get into premature interpretations of forensics opinions. The only conclusions if any that we can draw from the fact that someone was shot multiple times in the face and the head are that the intention was not merely to wound him. But no one is denying that as a last resort, the soldiers had to use deadly force in self defense. Remember, apparently two soldiers were also shot when guns were taken off a couple of their wounded comrades. And Israel has stated that the soldiers were finally authorized to use deadly force since they were faced with extremely violent and life-threatening attacks by the activists.
Also, forensics is a tricky science, and for decades there were theories about a "magic bullet" that killed President Kennedy, precisely because it is sometimes difficult to accurately reconstruct the motion of the target when it was shot. It took decades, and 3D computer models to finally put that theory of the "magic bullet" to rest, so I wouldn't draw any conclusions from the statements of this one guy just a few days after these events.
No one is disputing that deadly force was used as a last resort. And I don't know how many bullets even the best trained cop or soldier would have expended in such close quarters, when they feel their life threatened, and maybe have a broken arm, or knife wound. I don't know. And neither do you.
"Peace activist" stabbing IDF soldier
P.S. See also my reply to your earlier post:
Israeli navy opens fire on international aid convoy for Gaza : At least ten dead