Re: Thematic vowel etc

One more Sturtevant quote, ibidem:

The enclistic pronoun _-as^- 'is' [he] contains the pronominal stem
that appears in Skt. _asya_, Av. _ahe_ 'eius'. The reason why this
stem is so rare in IE is that it has been supplanted by the
conglomerate _tom_, etc. The connective _to_ might be followed by
other envclitic pronouns, as in Hitt. _ta-as^-s^e_ 'et ei, et sibi'.
Such are IH _sme_, _smy_ that appear in Skt. _tasmai_ 'ei' ans
_tasmin_ 'in eo'."

I can't understand why he doesn't recognize his own reconstructed
accusative *_som_ in IH _sme_, _smy_ here (eg. *to-os-so-om-o-i etc)?

Torsten