Yeah,
so CDIR_desires_priorities

clearly shows us that the A.I gets free something.

There is ASHIKAGA unit spawner
Porbably only gives stakes to ashikaga

And Boost_player_rivals, and boost player_rivals_at_war

Which probably gives stacks to your enemies

Then there are Army balancer, upgrades, and replenishment values.

Seems the A.I you are Rivaled against cheats hard