I'll introduce you to Gregory
Quote:I can only tell you that Gregory is a much less important person of the two.
BTW - Your phrase "a much less important person" isn't quite correct. One of the phrases below should be used instead:
the much less important person of the two
much the less important person of the two
a much less important person than the other
a person of much less importance than the other
It's the use of "a" when making such a specific comparison that is inappropriate. The phrase "the other" makes the whole sentence more general, and in that case, "a" is okay to use.