Reply to s4/Audio 10/Pioneer DJM800 Setup Help!

I am a recent convert to TSP from Serato and am loving everything so far. So many possibilities! My setup is pretty complex and I am hoping to get some help.

This is my gear list:

Audio 10 - TSP2
Kontrol S4
2 Kontrol X1s
Maschine
Pioneer DJM 800
2 Technics 1210 MK5s

I need to know what you believe the best setup would be. I put it all together toevening with my turntables taking up Channels 3 & 4 (Deck A & B) on the Audio 10. I thought I would just run the s4 (Decks C & D) to the input on Channel 2, but didn't believe that I wouldn't be able to do that because I now am trying to use 2 soundcards.

So, my question is, what would you suggest? I want to still use my Pioneer 800 as my mixer with everything running through it. This is my layout represented with words:


Do I route the S4 THROUGH the Audio 10? Do I get rid of the Audio 10?? I am at a loss.

Thanks so much!