... (possibility gap) implies "no longer follows" (absolute gap) from the premise ... "significant" amount, it no longer follows that most people would still ...
... "significant" amount, it no longer follows that most people would still ... raise," the conclusion no longer **follows** (not just 'may not' follow ...
When you see "without", "until", "except" or "unless" what follows becomes the necessary condition and then you negate the remaining term and it becomes the sufficient.
Thus... GAIS ----> L
... two kinds of assumptions. But logically speaking, that's not truly ... not a necessary assumption, and logically speaking, we shouldn't even ... , "if assumed", makes the conclusion logically follow, we've taken to ...