Sorry to complain, but as a brazillian I have to say I don't like the choice for the 4th component very much. Seems very generic and "mosqueteiro" literally means "musketeer" in portuguese.
If I were to choose I would pick the
Bandeirantes. They were explorers and settlers who searched the land for gold and, infamously, for indigenous people. But they played a big part in our history as they were responsible for greatly increasing our territory.
I obviously do not like what the guys did, but history is history and every civilization has stuff they shouldn't be proud about. It's more historically significant than a generic musketman, and you can twist them as something more positive like many authors did.
Now what they could replace is up for grabs, "scout" seems an obvious choice but it's too much of an early unit and that would be anachronous. Maybe have it replace the musketmen and add this ability:
When conquering a barbarian camp, can settle a 3 population city there and then. Increased vision, movement in jungle and forest, and has increased strength vs barbarians.
(Not sure if this ability is possible without dll though)