we as audience have been commenting on the diff between both women as people and as mothers but the makers dont highlight it explicitly. They showed that temple scene where Sai accepts prasad from P but P doesnt.but nobody else witnessed it and spoke about the diff in both women. BK claimed Sai and P both ran away with Vinu- NO. Sai told everyone and left, P ran without informing. Sai has always been up front. Even post Sam return when she left, she left a letter. Pullu knew. So it wasnt running like a coward. She has been kind to those who dont deserve it. She saved Ps life, Vs life, cured Vinu, was nice to K, M everyone! But the other characters do not speak up or compare and point out how Sai is far superior a person and is on a pedestal whereas P in comparison is in paatal lok. P is called mahaan by V and CN folks. her mamtaa is glorified. She is not a mother, she is a nanny.