Darth Zannah vs Darth Caedus

That doesn't make much sense, considering his stronghold on prakith was full of sith tomes, manuals, and scripts.

I think they contained personal beliefs of andeddu himself rather than sith knowledge. So while im sure there were tomes everywhere, they must not have had much use as bane doesnt aknowledge them and wyrlokk finds nothing

If that's the case, then Andeddu blogs about his feelings more than anyone I've ever met.

Not feelings, personal beliefs though.