If you got those followup articles in pdf format John I would like to read them.
Actually one of the main physical differences over 11awg cable, which I've found to be important for speaker cabling, is the use of twisted pairs found in 14/4 inwall wire. Its a feature which distinguishes it from a straight pair of parallel conductors and or course sets it apart from plain zip cord. The conductor pair reduced inductance while twisting the pair cancels out radiation from external sources such as EMF and also minimizes RF. I laugh to myself about the $700 which a pal of mine recently paid for a pair of 8ft Auditorium 23 speaker cables. Once you pull back the covering all they are are 16/4 twisted pairs with one solid conductor and one stranded conductor. Davis would not have approved of the solid conductor. The only other difference, as Rick suggested, is mine cost $675 less.
The connector can also have an electrical impact. The Ultralink connectors mentioned do the job though there are many other well constructed connectors available. I currently use Nakamichi connectors because they are relatively inexpensive and well made. All in, the DIY 14/4 twisted pairs plus connectors are very close and often less than the cost of zip cord so why not enjoy the extra potential benefits.
On the Canare wire, I like them as well because their construction is like the 14/4 inwall with more shielding. However I don't like that they are alot more expensive and offer no sonic improvement over the 14/4 in-wall in my systems.
Zip cord perform well, though I find the DIY twisted pairs tend to adapt better to more systems especially in downtown cities, condos or apartment buildings.
How much of the attributes mentioned above can be heard is very much speaker/amp dependent and environment dependent so don't be surprised if YMV.