Based on modern DNA patterns there also seems to have been at least one other major population group around the same time that we have not found any remains of,

Based on modern DNA patterns there also seems to have been at least one other major population group around the same time that we have not found any remains of, which was related to both Sapiens and Denisovans. They probably lived mostly around southeast Asia. (Neanderthals were mostly in Europe and Denisovans are thought probably to have generally inhabited northern Asia). I can highly recommend The World Before Us by Tom Higham, it goes into the history of the archaeology and science and also goes over a pretty up-to-date understanding of the topic of recent Hominin evolution. (Also, it's very likely I've misconstrued some of it in my paragraphs above, apologies if so).