Bandura - Bobo doll experiment

In the version of the experiment where the child sees the adult model rewarded (Bandura, 1965; Bandura, Ross, & Ross, 1963), why is it not just operant conditioning? In the version where the child is given an incentive/reward to imitate the model (Bandura, 1965), why is that also not operant conditioning? What are the limitations of or challenges to social cognitive theory? In what ways is it different or similar to Piaget&theory? Developmental systems theories? Core knowledge theories?