> Desperate as the attempts have been to identify it, there are _no_ traces
> of this Ablaut-phoneme in Anatolian or Indian.
Is "Indian" a misprint? Or do you refer to something other than Indo-Aryan?
e/o/zero ablaut is all over the place in Sanskrit, and exactly where we
predict it for PIE, eg -o- grade in perfect singular, zero in plural; -o-
grade in causatives, ablaut in nouns (strong/weak stems), same in verbs,
etc.