I agree. Your passion for the idea you're working on should make it more or less easy to explain it to others - maybe not concisely, but you can surely talk about it. Explain your vision exactly as you hope it to be - changing it to meet others' expectations hints that you don't have confidence in your idea. Put your application in. If it gets rejected, and you believe it's a good idea, why not pursue it anyway? Look at it this way - another 2-10% of your idea you get to keep to yourself :)