Re: Who put the Quasar Sabers in the Stone?
 

I agree with that. It was the ancient worriers of the lost galaxy. I do think Zordon knew were they were and had them in his contingency plans. There is no coincidence that The Megaship wound up on Terra Venture.

Re: Who put the Quasar Sabers in the Stone?
 

The Sabers were put there a long time ago but I don't see any link to Zordon. The Ancient Worrier theory seems like the best idea.