This is how I interpret it too. Whatever they were before the mind seed is lost and replaced by what you were 8 levels ago. This includes levels, skills, feats, memories, etc. So in your example, the mind seed host would not have any fighter levels.
I was curious about something in regards to a Psion's (Telepath) Charm and Dominate powers.
Dominate states that: "Subjects resist this control, and any subject forced to take actions against its nature receives a new saving throw with a +2 bonus.'"
This requires a fair amount of...