Ha, the mystery is finally solved!
That certainly makes a lot more sense than it just being a goof or something we "missed" somehow, because it was always such a weird thing not to explicitly show in that situation.
Also cool to actually have confirmation on one of the pieces of long-lost NC-17/MPAA cut footage too, after they've gained almost mythic status at this point. I guess that means Stan Winston Studios made a mock Gary Busey torso that was, at least for a while there, floating around out there (no pun intended
).
Either way, it's nice to finally have an answer after 30 years!