Yes, the left giant shaft in the map looks as though it serves no purpose. And, the right section really doesn't need all of those spawns... Looks pretty difficult, but not very...fun as in sorta impossible. With the mass numbers of zombies falling on top of you as you climb to the bravo flag; zombies falling on top of you isn't fun. I guess I could see that the left shaft in the map would be useful for the fact that it places more places where zombies could spawn other than the right section.
Yes. And no download neither... It does look kinda like a lazy job. Whatever, good luck with your future stuff.