Golldir says he is okay with "killing" the draugr (His ancestors) because we are supposedly helping them get to Sovngarde.

I soul trapped every single one of them.

Um.

Is Golldir clueless to the THUNDER AND LIGHTNING soul trap spell or did Beths just overlook that?

I realize it's a late reply but this is an interesting question--

Programming Golldir to react to that would take a long time and wouldn't be worth the risk-reward as the standard AI is not good enough to recognize spells. On a side note, Golldir is a great, relatable character andfollower.