There are some existing politicians with too different effects, and those that are unnecessarily re-used in multiple ages. To avoid confusion, some should be separated out for their specialized effects:
The Logistician (age 2)
This one is the most problematic. It covers too many different effects across civs. I’d only keep the military wagon related ones as logistician.
Arsenal-related ones: The Gunsmith or The Armorer
Spanish: The Conquistador (ironically this effect is the most related to the logistician)
Portuguese: The Bandeirante
The Logistician (age 4)
This one is duplicate and the effect is not related to the age 2 version.
Rename to The General of Fortifications, based on Marquis de Vauban as it delivers a fort wagon.
The Mercenary Contractor (age 5)
Duplicate.
Rename to The Foreign Legionnaire for the bonus on “foreign” units.
The Inventor (age 2)
Duplicate.
Rename to The Aviator or simply The Balloonist, based on the Montgolfier brothers.
(Not changing the age 5 version due to Leonardo’s tank for Italians)
Feel free to write your ideas if you have better ones.