Because many of those delegates would be happy to support the other candidate as well, they just have to give e preference. Support Hillary does not equal doesn't support Obama. There, simple really.
Your answer is that we should nominate someone with fewer than 2,209 delegates supporting them because many of those less than 2,209 "delegates would be happy to support the other candidate as well"?
Sorry, but that doesn't fit through any logic gates I've ever come across.
