I'm not going to dig so much into the Olmecs, because really, there's way too much we don't know. However I do find it curious that they are getting the javelin throwers (Atlatl's) I would have imagined they would have been better suited for the Toltecs.
Idk, I just thought atl atls were regionally popular weapon typical for Mesoamerica. But I don't know.
Fun fact, Olmecs are one of very few peoples with completely undeciphered writing system. Other such writing systems belong to Indus Valley civilization, Minoans and IIRC at least some forms of Elamite language. Oh, and Andean Quipu (although we are not even sure if it is writing system or more accounting mechanism). Imagine how much knowledge could we get...
I have already said that and I will repeat that: I am more and more fan of HK's 'no preset historical leaders' approach, despite it initially sounding underwhelming when compared with enormous emphasis civ puts on its leaders. At this point I'd even accept that without customizable 3d avatars based on culture, but that last bit makes me already love this system more than iconic civ leaders.
Humankind's approach to leaderes solves SO MANY problems inherent to civ approach 'immortal historical leaders for civs' - so many!
1) My favourite. It enables us to freely explore a lot of amazing civilizations which didn't have enough written accounts or simply lost accounts of leader biographies. In civ if you want to add ancient, old, archeology-based civilization with no or barely known leaders you need to do crazy maneuvers such as desperation of adding mythological characters (Dido, Kupe, Gilgamesh etc) or just resign completely. Modders did desperate token noname leaders for certain civs but it wouldn't be acceptable by devs.
Let's count some awesome civs for whom HK leader system is fine while Civ systems leads to a ton of pain: Harappans, Precolonial Philippines, Olmecs, Toltecs, Zapotecs, Mixtec, Ancient Pueblo, Mound Builders, Chimu, Tiwanaku, Nazca, Caral, Swahilli, Zimbabwe, Yoruba, Etruscans, Nabateans, Elam, Canaan, (to lesser degree) Phoenicia, Sumer, Khazars, a ton of nomadic empires...
2) It avoids the eternal problem of unachievable female leader parity and conflict between equally miserable options of a) very few female leaders b) horrible token female leaders such as Gorgo, Maria the Mad, mythical Dido or - with all respect for her power but - Catherine di Medici c) constantly having the same few leaders reappear due to sheer desperation (good like seeing many diverse monarchs of Russia, Spain and England when we have to constantly roll between Catherine the Great, Isabel, Elizabeth and Victoria because they have to compensate for horrible lack of strong independent great female leaders in patriarchal history)
3) It avoids the ridiculous problem which sounds like nonsense but it actually and famously made devs unable to add Pueblo civ for civ5 BNW - legal shenanigans with some indigenous peoples who not allow to use their language, leader etc to be displayed in a game due to fears of desacration
4) It avoids the trap of investing enormous amount of resources and time in leader animation and voice acting... With bad AI and diplomacy anyway, frequent issues with voicing extremely obscure languages (hello Huns) or controversies with art style (to this day I dislike extremely cartoonish nature of civ6 leaders, over some of them I'd honestly prefer standstill historical portrait)
5) It avoids unavoidable clash between game UI and historical immersion (immortal king in democracy, merchant republic, or my favourite - communism; George Washington with the globe in the bronze age; immortal unchanging leaders in general, really)
mind you, those were just flavour problems, there also huge gameplay problems with civ system of leaders.
6) Civ system of eternal leaders, in 90% of cases one per civ, makes any system of civil wars utterly impossible. Because most of civil war factions would either need to have clone of a leader or no leader at all - and that's not something Firaxis would agree on. So goodbye split states, secessionists and proper revolutions and uprisings.
7) Civ system of eternal leaders with well established characters necessitizes to some degree diplomatic AI representing their psyche, as it could be another hit to the immersion if they didn't. But that generates countless problems with diplomacy (I am to this day big enemy of civ6 agenda system).
8) It also has another bad result, when personality of a leader completely derails gameplay focus of an entire civilization. Worst cases are probably India forever doomed to being doormat pacifist as a whole due to its leader, Greece birthplace of philosophy usually being forced to be insane warmonger due to Alexander (thank God for that Macedon split), or my eternal disappointment with Sumer (the first civilization! so much potential!) being reduced to... Epic of Gilgamesh the Warmonger: the Civ.
Civ6 is particularly extreme in this regard with the terrible idea of assigning each entire civ very irrational super extreme 'agenda' system which makes leader hate you for most idiotic aspects not making sense in-universe or in real politics really. My personal favourite is hatred for not having fleet as a power without acces to the sea.
9) Civ system of a singular immortal leader being unchanging real life figure utterly cripples some potentially interesting mechanics such as dynasties of early eras or elections of later eras.