In all of the RTK themed games it seems like Sima Yi is 'Wei's strategist' and that the other strategists of Wei get a secondary role or appear average. Sima Yi wasn't involved with Cao Cao in his Heyday. I think of Sima Yi more as to Cao Pi and Rui as Cao Cao was to emperor Xian. Cao Cao had a number of great warlords who could be portrayed as 'his strategist.' Jia Xu proved he could outwit a trickier opponent, Xun Yu and Xun You are related and both die sudden deaths later on, and of course there's Guo Jia; surpassed by none except Kongming himself.
Personally, for the next big thing(be it DW, Kessen 4, DT3, whatever), I'd prefer the emphasis on Xun Yu and You.