What do you think are the odds Akainu and Aokiji faked their intentions at the end of the battle.
Like both felt something was wrong and decided to operate secretly together to infiltrate the biggest world threat that’s Imu.
Akainu and Aokiji decided to secretly feed BB power until he cross cancels Imu and then they establish a new world order with defected marines and countries.
Kuzan former justice was "burning justice" which changed after Ohara and it became "lazy justice" - justice to be applied only when it's a necessity and with minimal force.
It drastically differs from what Akainu has - absolute justice.
Even if both kuzan and Akainu are aware of someone running the WG from behind the lines, I really don't think they came across IMU even once or wants to take down WG through any secret plans.
Their values differ.
For Akainu, wiping out pirates will bring the order.
For kuzan, I think his justice changed once again - something more tuned with the reality of the world.
Perhaps now he doesn't see WG as any just organization anymore in any way