If you look at last years thread, they do not send II like other schools. They will put 'weaker' candidates scheduled out in February, but give them the invite near their completion date. I actually think this is much better than having to wait for months when the school knows it won't give you an interview till towards the end. As one of those 'weaker' folks stat wise, I fully expect that when/if I get a interview, it will be in Dec or later.
So moral of story= they aren't running out of interviews, they just schedule them by priority score.