@Shri: I loved your comparison between Ravi and Pintu as per their backgrounds, their upbringing and their relationship to Krishna.
I would also add one more point to that and that is how each of these two young men have reacted to Krishna's struggle and her success. This point came to mind when I was trying to reconcile the Ravi who started doing mazdoori and was on an honest path until Krishna's success, to the one we see now, entitled and immoral.
When Krishna was struggling, it was Ravi who became inspired by her fight to do something for the family as well. He saw her through her Satyagraha and saw how hard and genuinely she was working for the betterment of the family so he thought he would contribute and took up even the most menial job. But once Krishna succeeded, he felt that their struggle was over. He stopped seeing himself as an individual with responsibilities and since the family was taken care of by Krishna's success, he dropped everything else and took part in that success as though it was his own.
Pintu on the other hand, was totally embroiled in his family and content to use the resources of his family to help Krishna during her struggle. He didn't really feel the need at this time to distinguish himself as an individual and seemed quite happy to be TTS' son and avail of the benefits that afforded. I have always maintained that he helped Krishna at first because it made him feel righteous doing it and because of a certain attraction to her indifference and her difference from other girls. He became a part of her struggle through his family, ie Babloo and fought for her through his family's resources, ie that Scorpio, all the bribes etc. However, her success was a turning point for him. While it made Ravi's identity retreat into oblivion behind Krishna's clout, it made Pintu emerge as an individual, thanks to the break that happened from his father, because of crimes against Krishna.
I guess it all comes down to the question of respect. Pintu respects Krishna enough to understand the status she has achieved because of her efforts as an individual. This echoes the reason he left the Singh house. It inspires him to find his own individual path. On the other hand, Ravi was never taught to respect women as his own mother supports his every wrongdoing against his sisters, even when they are right. So he does not respect Krishna's achievement as her own. Even in his desire to help when he tool up work, there were undertones of this..."if the daughter of the house can do so much, what should the son be doing?" The same way he accuses Krishna of becoming a BDO only for herself, I think he was working only for himself, because at that moment it made him feel powerful. But now he has a new power trip, as the BDO's brother and so he has embraced that. So we are seeing a sort of reverse development in Ravi as opposed to Pintu.