Using Toslink or RCA for signal distribution

[heedicus]

Pardon my ignorance as this is the first system I have put in a rig for about 20 years, so all the technology is new.
Here is my plan-
Factory head unit in a '17 F150
all JL Audio

Fix 86
VXiHUB
VXi-600/6
4x C2-650x
2x C5-075
VXi-600/1
10w6V3

The question is:
If I swap out the Fix 86 for a Fix 82 I should have Toslink outputs that I could run into the VXi-Hub which has a digital distribution block. Then use the Toslink to send audio to both amps separately. But if I do that it only comes in as 2 channels so there would be no fading capability?

I plan to use the TuN app to tune the system once installed.

What else am I missing here?
Thanks

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