Thinking on things over the week, I decided to use the remaining oil in the pouch. Basically, there's a gallon in the differential, minus a tiny bit of spillage and whatever remained in the bags.
I think Banks designed this cover biased towards the standard Ram fill (some of those applications are greater than others, but by Amsoil's website, capacity is minimum about a pint greater than GM applications. In the picture, the differential appears fairly tilted, but it is really slightly tilted; the camera angle is skewed.
With ~8 pints, the level is midway on the sight glass; you can see the center hole of the baffle to more closely judge the level. Regardless the 6.3 pint fill spec, I'm going to leave it as-is. I don't blame Banks for erring on the conservative side, and I don't know why there's such a difference in specs between GM and Ram. And I'd also speculate the cover volume is pretty much the same as the stamped steel, as @Chuck FB noted relative volume with his recollection of another member's fill experience.
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