DC> Interestingly, the 4 introductory lines are all in the normal
DC> (pathyaa) form, whereas the 12 lines of teaching material are split 8
DC> pathyaa, 4 vipulaa.
Are those 4 vipulaa the last ones?
DC> Undoubtedly this is too small a sample to convince anyone that the 2
DC> introductory verses were a later addition, but it does suggest that
DC> we should keep our eyes open to this possibility.
We can open eyes even wider and suggest that in the early version
there were only 4 last verses ;)
Speaking more seriously, I think that such analysis should be
multifaceted and involve also the lexical and grammatical usage in the
analyzed text.
It's like checking the currency: if it lights up properly in
ultraviolet rays, has watermarks, relief, intricate ornament and foil
strip, then it's most likely genuine.