I have 2 open Monitor sends as well as 13, 14, and 15 inputs open.  Would I be able to do this with just the Stagescape or would I need another mixer?  I apologize in advance for coming off as a nube but I don't have much experience with mixing drums. 
  
Here Is how I would assume this is done.  I currently mic the Kick, Top Snare, Bottom Snare, 2 Overheads. 
  
1. Set up a stereo monitor for C and D. 
2. Send each drum mic to this stereo monitor. 
3. Plug a XLR Jack to 1/4 IN Plug from C to input 13 
3. Plug a XLR Jack to 1/4 IN Plug from D to input 14 
4. Assign Drum Bus Crush preset to inputs 13 and 14 
5. Send both the original mic inputs and inputs 13 and 14 to the Main outputs.