[Monahammer]

Originally Posted by Fuzz

We have less than we used to, but it was as high as 9%.


https://humanorigins.si.edu/evidence.../interbreeding


That indicates there must have been more than a just a little mixing. If it's 1-4% now, you could imagine it may have been higher in the further past.

If all humans were hybrids, the percentage of their DNA remaining wouldn't decrease that notably over time. This is an indication of only select specific populations were ever "hybrids", and those have long since been subsumed by regular homo sapiens over successive generations.