WMG / Tactics Ogre

Lans Tartare's real agenda
Warning: this theory uses the plot of Knight of Lodis.

We know the following:

Therefore, I theorize that Lans Tartare's real agenda is to find Eleanor and/or Shaher. His plan was to exchange Eleanor for Catiua.
  • His quickness to leave when things went south was more a reflection of his experiences with similar things. He knows all too well how such things go; badly.

A Gaiden Game or even a main title game (episode IV?) was going to be about Andoras

My theory for the series was that episode I was the titular Ogre Battle itself, and that the others were about how humans treated the world after they won it, with games dedicated to Lodis's rise and fall amongst other countries such as Xenobia and Valeria. Andoras would have had one game about the Lodissian invasion of his homeland. Honestly, I think They Wasted a Perfectly Good Plot or maybe they had plans with him. Then again though, there's also Volaq - while he didn't have much of a backstory, they really could have done more with him than they did.

Vyce was destined by the Wheel to oppose Denam.
Similar to Jowy from Suikoden II or Fuuma from X1999. He loses his sanity if the Wheel forces him to be evil.

The big choice has more of a role in Vyce's changes than some may think
The WMG above may be the cosmic reason, the down to earth ones is that when Denam makes his choice, it causes different emotions to rise up in him, channeling his hidden jealousy which came to a boil.
  • Lawful Route: His feeling were tempered with righteous outrage with what his friend was doing, preventing the toxic effects of those feelings. And as he became a leader in his own right, he overcame his issues, finding in himself to help his friend once it's clear he's taking things in the right direction, a far cry from swearing to kill him early on.
  • Chaos/Neutral route: Seeing Denam remain ever the paragon causes him to snap fully, mentally justifying anything he does. And over time he only gets worse as he drowns in his flaws and resentment as he attempts to bait around larger groups, until it comes back to fatally bite him. If anything, Denam coming back into the fold on the neutral made things worse as he had to see his bosses favor Denam in spite of his betrayal.

The Taken for Granite Statues in the Palace of the Dead are backup bodies for Beelzebuth.
Yeah, she says she'll wait until a party of adventurers comes and then kill and possess them; but staying incorporeal is difficult (and there's no reason to tell Denam that.) She'll "soften" one of them and wait in it while waiting; they've been stone enough centuries that the bodies are substandard; and fresh bodies are better; but each one can last a little while.