Superpilot,
I have extreme doubts that the questions you were asked and your replies had anything to do with you not getting the job. Getting sponsorship is very hard and competative. They were probably inundated with responces and they simply chose those who were maybe a little more advanced in their experience. The fellow who interviewed you was probably no idiot and was almost certainly aware that you had no multi-crew experience.
Don't let it put you off, you have a dream - try and try again!!