> Wally, the last common anchestor, for gorillas  even
> further away
> than for chimps, were wood inhabitating primates.
> They were certaionly not prey-eaters.

Quoth Ward: (emphasis '>>>' '<<<' mine):

50,000,000 to 30,000,000 B.C.: A gradual shift in diet
for these primates to mostly frugivorous in the middle
of this period to mostly herbivorous towards the end
of it, but with considerable variance between specific
primate species as to lesser items in the diet, such
as >>> insects, meat, <<< and other plant foods.[9]

>
> 7 million years ago primates were eating mainly
> fruits.
> since 30 mio years (these timeline from books AND
> from Ward N.).
> (at

Quoth Ward: (emphasis '>>>' '<<<' mine):

Approx. 7,000,000 to 5,000,000 B.C.: After the end of
the previous period, a fork occurs branching into
separate primate lines, including humans.[12] The most
recent DNA evidence shows that humans are closely
related to both gorillas and chimpanzees, but
most closely to the chimp.[13] Most
paleoanthropologists believe that after the split, >>>
flesh foods began to assume a greater role <<< in the
human side of the primate family at this time.[14]

End quote.

Obviously, while the earliest primates were primarily
vegetarian, there was, at least, some flesh eating
prior to the divergence. Note that flesh foods took on
a "greater role in" rather than "were introduced into"
the diet at the divergence. My point still stands.
*If* the gorilla study is accurate (Todd has cast
doubts on it), then it is possible that the gorilla
population "should be" eating more flesh foods.
Perhaps not as much as their more carnivorous cousins
(us), but more none the less.

The other possibility is that the particular gorilla
"tribe" studied was an abberration.
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