I think of ABO as a term that defines an aspect of knapping that came before modern forms of knapping which tend to produce lithics with metal type tools. ABO lithics are produced with materials available to the knapper based on location and contact and tend to produce lithics with organic and natural materials i.e. antler, bone, wood, ivory, stone, etc...and to a lesser degree copper.
ABO to me represents a set of tools predating wide spread copper industry (different times different places). So as I work my ABO tools I do so with a particular intent. Maybe I want to produce a point for my arrow for fishing and I want it to be small and have two hooks on it. This design in my head is mine. I now have no intention of replicating an others design. I then develop a set of skills particular to the design.
Replication is a process of learning how to influence the stone in a manor that produces another persons design. Both of these processes could use ABO tools and produce different ABO effects.