OK, Ive been on live chat with Microsoft for over an hour. I downloaded Halo 4 War Games Map Pass which incluse Magestic and Crimson map packs. Here is the problem: Crimson doesnt show up at all within Halo 4. 
  
Things Ive done to fix it: 
1. went to system download history and downloaded it again. 
2. deleated crimson map pack from system memory. I then downloaded the crimson map pack again. 
3. I then deleated all of Magestic, Crimson, War Games Map pack files from my Xbox from system memory. I thern re-downloaded the Map pass again. 
  
Nothing has solved my problem. Magestic shows up, but crimson does not. If anybody has any productive advise, that would be awesome!!