Alright, took some time Friday evening after shutting the shop down for the day and disassembled the LS6 shortblock.
Fully expecting to find some catastrophic damage, that was proof of the reasoning for the engine being pulled for a "knock".
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There was absolutely nothing wrong with this shortblock, it was 100% without a doubt, another set of Texas Speed "LS7" style lifters killing an engine. All of the bearings were super clean, rod, main, cam and the bores were indicative of a true 55,000 mile engine.
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Delivered it to the machine shop Saturday morning, should be back sometime in May as a shortblock.