Thanks Gary and Anthony for pursuing this to the final response. I have added the summary to the X32 Wiki.
to err is human, to really mess things up you need a computer...
As I understand it, the "cross-shaped" divider is used to add additional isolation between the wire pairs and is used in some of the "tactical" types of Cat5e to help ensure wire pairs from being "mushed together" (real technical term) when the Cat5e is either flattened by direct pressure or when the wire pairs are brought together as a result of excessive pulling on the cable.
It is all there to help keep down the crosstalk between adjacent pairs which would compromise the high speed data capability of Cat5e and Cat6 cables.