That’s an interesting take, thanks.
Etymology — you start with multiple plausible origin stories, and sometimes on further investigation, more than one are correct. Which causes madness.
Following your suggestion a little, I found this: https://www.etymonline.com/word/crack
“crack” meaning “top-notch, superior, excellent, first rate” (as in a crack shot) is slang from 1793, perhaps from earlier verbal sense of “do any thing with quickness or smartness” [Johnson]
So that is almost exactly the years we were talking about the word first being documented, Revolutionary war to 1790. Your idea may be a little anachronistic if Johnson was correct that that sense came in in 1793 and that quote was written during the revolution. OTOH it may have been used in a memoir.
My favorite is the origin of “Uh-huh” (yes), and “Unh-uh” (no). Thought to be from African languages introduced to American/Southern colloquial English by African slaves.
Wow never heard any theories on grunts like “uh huh”. LOL
The quotation noted actually said cracker, not crack, so it could indeed have been either a progenitor of the term “crack” or a version of it, in this case noun vs adjective. That is, if it was written during the war.