Ablative /-to/

Hi, Jim:
Here is a wild speculation. Can we not regard that the affix /to/
had developed from the word /tato/? I still think that it is a
grammaticalized affix. Grammaticalization is a very common phenomenon.
For instance, in English the lexical words, "have" and "do" have been
grammaticalized to a great extent, losing the original meaning of "to
possess" or "to perform". You use the grammaticalized "have" in, for
instance, present perfective, and use "do" as a interrogative marker.
Further more, "have" can be trancated as "'ve", losing the orginal
sound quality.  So, the Pali /-to/ may have originated in a lexical word,
which may not have the exact sound value as the affix. Am I twisting
your arm?  tadao
.