I think there is one other important item you should have gleaned from the exchanges re: Traducianism vs. Creationism and your other readings on the subject. Did you happen to notice that NONE of the Calvinists who held/hold to Traducianism rely upon it to support other doctrines. And why would they when most, like Dabney realize that it is one of those "mysteries" which isn't fully revealed in the Word. However, there are those like speratus and many/most Lutherans who are bound to Traducianism as they have built other parts of their theological system upon it. Thus it becomes a serious caveat to them when it is removed.
Doesn't the WCF also use elements of traducianism in its doctrine of original sin.
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They {Adam and Eve} being the root of all mankind, the guilt of this sin was imputed;[6] and the same death in sin, and corrupted nature, conveyed to all their posterity descending from them by ordinary generation.