I think one has to be flexible enough to understand the pros and cons of the modified idea/design suggested by YC ... Paul and his team are experienced enough t

I think one has to be flexible enough to understand the pros and cons of the modified idea/design suggested by YC ... Paul and his team are experienced enough to have clear big picture about how market (including angels and VCs) will respond to the your idea and whether little bit of tweaking can help !! Flexibility is also directly linked to the listening skills !!! Also i understand that chances of getting selected are high if you have a great team and they may invite you for completely new idea that they have in their mind and they think that you can deliver it, to this I think its a testing time whether you want to give-up on your idea and join the YC team to develop new idea or do you still want to stay with your original idea because you are passionate about it (catch-22 may be) ...