The natural flow and natural explanation of Romans 5:12-19 is that condemnation upon the whole human race occurred at one point in time (Gen. 2:17) by the actions of one man (Rom. 5:12,17-19) and that is why Death can precede any individual actions by Adam's posterity to merit death. Meriting death was due to one man's act of disobedience.
All interpretative theories that deny this must repudiate Paul's repeated statement that "condemnation....be dead....made sinners" of many are not due to their own individual acts of sin but due soley to "one man's disobedience." They must repudiate Paul's words because their view demands that every man is judged solely by his own actions, is condemned by his own actions and "be dead" due to his own actions and are "made sinners" due to his own actions which Paul repudiates but claims their sins are but consquences (including unbelief) are consequences of being "condemned already" "dead" already "made sinners" already due to one man's sin.
Romans 5:12 makes this assertion by using the same aorist tense for all verbs (entered...passed....sinned") showing inseparable simeltaneous action demanding the undivided human nature was condemned, dead and made sin at that point in time and therefore all mankind who are but products of that fallen nature are born sinners by nature, born spiritually dead, born condemned and thus justly subject to death from conception apart from any sinful deeds of their own.
Romans 5:13-14 proves this is true by eliminating all laws but Genesis 2:17 that can explain universal death.
Romans 5:15-19 proves this by clearly and explicitly and repeatedly saying that this condemnation, deadness, sinfulness of many has its cause in one man's disobedience and not their own sins plural.
Case closed!
When it takes pages to present your case , it it inversely proportional to the strength of you argument and understanding of the doctrine. More pages, weaker argument