Taking a tiny sample size of fossilized remains and placing them into chronological order based on rock layers and carbon dating, then claiming they represent an evolutionary chain is pseudoscience. There is no means to verify or falsify the stories (hypotheses is giving too much credit) that are spun by Anthropologists and Paleontologists. Many of the supposed human ancestors are known only from a tooth or a piece of a skull. Fossils give virtually no context to help us understand what they actually were in life and if they represented an ancestor species, an odd deformity/mutation, or an offshoot species that didn't make it. We don't know what time period a fossil species existed for (especially when we have exactly one example of said animal). It is entirely possible what we call an ancestor species coexisted with one of our actual ancestor species.
The truth is, barring time travel, we will never really know what happened thousands or millions of years ago. The best these soft sciences can offer are plausible sounding stories.