what if you used the console to move Einarth towards you?
prid 000886B5
moveto player
Einarth is passive, no matter if he is in the main hall with the player or outside. I think this bug affects quest scripts. E.g. when the player character first enters High Hrothgar, there's no assembly of the greybeards. Just Arngeir talks to you. The other greybeards are either not present or just praying and not interacting at any point in time.
In the other http://www.gamesas.com/topic/1322173-the-way-of-the-voice-game-breaking-glitch/ a guy with a vanilla skyrim 1.3.10 started character (no mods, graphics, etc) has the same problem. It looks like this is related to the latest patches.