i read my points in this post, just wnt to highlight one thing,
Indian immigration officers (even arline staff) ask indians many questions, while exiting india. But they dont ask anything with foreign passport when exiting india.
Similar thing i have seen outside india specially in south east asia, they ask local questions to passport holder, while exiting country, but dont ask anything to foreign passport holder (irrespective of travelling back to india or to third country)