Legality of Manmohan Singh as prime minister !?

I do not think there is any legal problem for Dr. Man Mohan Singh but yes morally its incorrect to occupy this seat of power without being a MP from lower house . But merely being an MP from Lok Sabha is not enough morally , a Prime Minister must draw his power from very large sections of people of country . Like Mr. Rajeev Gandhi was a really popular leader , may not be very competent , same was with Atal Bihari Vajpayee , but Dev Gowda Ji , Inder Kumar Gujral were occupying seat in perfect legal manner but had no mass appeal . This is the reason Dr. Man Mohan singh is not perceived as a mass leader , i do not think any one listens to him when he speaks to the nation , because he knows he is not a real leader ,he does not draw his authority from people of India but from Mrs. Sonia Gandhi , but that is how our system works , its just by the way that He happens to be a competent person to some extent , so long he works hard for nation , its ok to have a appointed PM , because elected PM has not done any better than him.