Current view show Kentum languages as more
conservative (so not necessarily monophyletic), while Satem was a monophyletic
branch (k^> palatals), but in Kentum languages the shift k^> k must have
been very old, to explain the drop of slight palatalization, instead of a more
extreme palatalization. Does it show that kentum languages might have been a
common origin from the original PIE?
Joao SL