Master Sun's basic approach to solving the problem still relied on the Immortal Machine Brain, but he took a completely different direction than Mark.
In Master Sun's solution, the role of the Immortal Machine Brain was no longer merely to assist Armed Immortal Soldiers in controlling several Martial Fighting Immortal Machines. Instead, it transformed the Immortal Machine Brain into a true "brain" capable of independently controlling a larger number of Martial Fighting Immortal Machines and forming its battle formations.
When the Armed Immortal Soldier wanted to perform an action, they would send instructions to the Immortal Machine Brain, which would then decide how to execute the action on its own.
However, to achieve a level comparable to an Immortal Venerable, twenty Martial Fighting Immortal Machines were clearly insufficient.