The comparison and contrast the author makes between Zeta and Alpha are justifiable only on the premise that the two companies have not changed during the ten years’ time.However, the premise may be false, since it is, with no concrete evidence, an assumption. In fact, the ten years is a time long enough for any company, for example, the Zeta company, to make improvements. Also, during such a long time, a company, Alpha as an example, may also witness its unfavorable changes. Unfortunately, the author, apparently without considering this possibility, falsely uses the situation ten years ago as a reference to evaluate the two companies in today’s situation. As a consequence, since the whole argument, consisting of the many contrasts, depends on that premise, little of the argument would be valid if the premise proves to be false.

这个逻辑点是关于时间的，在文本的一开始就出现了。作者在此默认的条件是如今的情况与十年前的情况是一样的，但是这个默认是主观的（因为作者没有用任何客观证据去说明）。那么，在这个无端的默认的前提下进行的后文的所有比较都可能是没有意义的，因为那些比较都是基于这个默认。于是，这里我们就找到了一个questionable assumption。并且，这个questionable assumption，作为整个argument的大前提，被我们证明可能是unwarranted（指令里的要求）时，我们就进一步讨论了整个argument受到的影响。