it seems like something is missing from this pic still…
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four decks
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three decks (because lets be realisic you don’t need 4 channels
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2 deck loop recorder/sampler
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ill test the 3 deck model for you 
four decks obviously, 2 normal players and 2 MFP
Why don’t you need 4 channels…?
if you want to remain musical you only need 3… eg
two instrumentals and an acapella mixing between
two tracks and a sampler. with three decks you have the option to repurpose three of the middle knobs for master and headphones and cue/mix, then have the slider as sample volume, and the remaining knob the sampler effects knob.
If you want to play four tracks there is usually two options… play techno or have too much sound going on. IMHO three is all you need