Dong Zhou wrote:I would perhaps unlock the latter camapigns once you have played Jin's. As for Cao Zhen, I think the problem for koei adding him will be that balance. They want the Sima vs Zhuge so you either get a joke Cao Zhen or Sima Yi being diminished as the super intelligent guy whose knowledge of his great brain leads to Sima's going rogue.
They could use him in the same way they use Cao Pi; a young member of the Cao clan who seems a worthy "successor" to Cao Cao's leadership who ultimately dies too soon and is replaced by unworthy successors, prompting the eventual takeover of the Sima Clan.
After all, the relationship between Cao Zhen and Sima Yi appears to have been functional. I think it would actually be easier to use it as a jumping off point to Jin's ascension than Cao Pi's relationship with Sima Yi, considering how short his reign ultimately was.