Dave Zinkand's work at DF looks really impressive. The course has always been a great walk, but the renovations appear to have added a lot of interest and a level of refinement that this wonderful track deserves. Some really thoughtful changes to enhance a few opportunities that existed.
It's been several years since I've teed it in AZ but I'd have to say that the rankings do not align with my personal sentiments after living there for a couple of years and playing many of the pubs and privates listed.
Whisper Rock is a really cool club - a fun and unique spot, but DF is a more interesting walk and architectural experience for a purist than either the Upper or Lower.
WKP Saguaro is well worth a visit and I'd rather tee it there over many on the list above it for interest and enjoyment.
A thorough review of The Other Course would be welcome (although it sounds unlikely). The land at formerly knows as GCS is pretty rad and the original course left so much to be desired.