Sai is someone who is his fantasy, like a costlier thing for him and his consciousness. He looks upto her, praises her for her righteousness and all good qualities which maybe he can never possess, however, the same righteousness when used against him, makes him feel inferior is the difference.
Pakhi ka tamasha now comes in chalta hai chalta rahega type of drama, see everyone's reaction when she starts. No one takes her seriously anymore.