I totally missed that. I just know he was interviewed for this past winter session, and it came up that he was a single founder. I sure hope he gets in, because it shows that you don't always need a team if you can invision, design, draw, code, and test your idea yourself. Too many cooks can spoil the broth, sometimes. Plus, I believe when leading a product that you need to have one leader, not a committee. And, the other thing I believe is that a leader must be willing to do, by himself, anything he asks of others.
1) i have other people working with me on this. i did prototype it alone, but i don't intend to be a single founder. i won't belabor it here, but it's really a good idea to get other people on board and the reasons yc and everyone have for not encouraging single founders are valid. your odds are much worse, and playing superman gets old after a while when you're trying to do everything -- and it's more fun to have more people involved and excited about the idea anyway.
2) re: applying: i am applying for this round, but actually didn't apply for funding for the last wfp. however, i did apply 2 years ago (with a cofounder) with another idea and wasn't selected.