Hello Aniduan,
Yes. Aggañña Sutta does not discuss “Cakkavāla” and “antakkappa” (“world systems” and “the four phases of a kappa”).
As I mentioned in that post, some information come from other suttas. There is no single sutta that covers all that material.
Aggañña Sutta mainly discusses the “reverse evolution process” starting with humans with fine bodies who “descended” from brahma realms.
– Basically, by the time their lifetime in those higher realms are exhausted, they gradually come down to lower realms, as their “hidden gati” (“anusaya”) come back.
– With time, humans also “descend” to lower realms (such as animal realm), when the Earth also changes and vegetation suitable for animal life appear gradually. It takes multi-millions of years.
– It is interesting to note that scientists have now traced back the appearance of bacteria to about 4 billion years ago (the age of Earth is estimated to be about 4.5 billion years).
P.S. After bacteria came vegetation and small animals to be followed by more complex animals. So, that phase of the evolution of animals is similar to what is proposed by Darwin.
– The main difference is that humans first appeared with fine bodies (without sex organs); their bodies got more “dense” with time; sex organs appeared next, etc.
– Of course, the initial births of humans were “opapatika” (without coming out of a womb).
– The complex part is that “reverse progression” of humans.