The Burial Tomb also has a drawback of making Egyptian cities more tantalizing to conquer.
The Sacrificial Altar and Skola each give +1 happiness because an extra point of happiness per city is a really strong change. It encourages ICS and a wide playstyle, and can be difficult to balance. An extra point of happiness is worth more than +2 culture.
But.. but... hey! How about eliminating the gold maintenance, then? Or at the very least reduce it to 1... Both the Burial Tomb and the Mud Mosque have no maintenance cost, it really seem unfair to the Aztecs [I'll admit, I kinda like them].
Pretty please, with sugar on top?

I tried, though. Muskets seemed to have played a large part of Brazil's history. My initial idea was to have a "Triple Alliance" soldier (from the Paraguayan War), but I didn't like how it turned out, so I made it the generically-named Mosqueteiro instead.
Sorry for answering a line not adressed to me, but can you give a link to whatever you did read about muskets [a mere weapon] having played a large part in Brazil's history? Because I have a LOT of books about Brazil's history [as I'm brazilian and love all kinds of history, from all places] and never saw anyone praise this weapon like this. Also googled and didn't really find anything relevant about it, neither in english nor portuguese.
I know the musket was widely used after the arquebuz became obsolete, but that's not something exclusive to our history. I really would like to take a look at your sources [not to inquire your views of it or anything, it is just really curiosity - the more I can learn, the better].
But despite what I may read on these sources, if you provide them, I'll still give my undying, never-ending support to the Bandeirantes option. Why? Because whatever huge impact the deployment of muskets had in military balance, they were used by Bandeirantes!