Behe, the Krebs Cycle, and Models of Origins of Complex Biochemical Structures
Post of the Month: December 1999
http://www.talkorigins.org/origins/postmonth/dec99.html
You fail at research.
This does not prove that it happened that way, nor can this be replicated in any experiment.
That is, they cannot take a cell without a Krebs cycle, give it the initial starting conditions, then wait through several generations and then end up with a cell with a Krebs cycle. The term "opportunism" in this case is simply a synonym for "something magic happens".
Theres something really bothering you guys. Maybe you are not aware of this.