A copule questions as regards this passage

A copule questions as regards this passage

I'm sorry for such a unclear title, but I really can't figure out a better
one to include all my questions.
The follow passage is quoted from "An Illustrated Brief History of Western
Philosophy", and I have three questions.
One is sometimes invited to believe that the final stage in the
understanding of Aristotle's metaphysics is an appreciation of the
profound and mysterious nature of Being qua Being. Rather, the first step
towards such an understanding is the realization that Being qua Being is a
chimerical spectre engendered by inattention to Aristotle's logic.
What does rather at the beginning of second sentence mean here?
What does such an understanding in second sentence mean, does it mean
"that the final stage in the understanding of Aristotle's metaphysics is
an appreciation of the profound and mysterious nature of Being qua Being"?
What was engendered by inattention to Aristotle's logic, the realization
or a chimerical spectre? If the answer is latter.Then, what if I want to
say the realization was engendered by inattention to Aristotle's logic?
Thanks!