INTERESTING DEVELOPMENT:
Found some details that explain the confusion and mixed results.
The original leaked version 3.16 for the Titan (as obtained from the first link at
http://forum.ppcgeeks.com/showthread.php?t=16806) actually contains 2 separate .nbh files: 3.16.651.0.nbh and Special_4350_SPC.nbh).
The 3.16.651.0.nbh archive contains a complete update with radio called 785.nb which when flashed to the Vogue shows up as radio 3.27, but does not boot.
The Special_4350_SPC archive contains Radio.nb which when flashed to the Vogue shows No Radio, but does allow it to boot, and appears to work.
These radio files are different in length and vary substantially in content.
Furthermore, both these archives contain new SPLs, which also vary significantly.
So now that we know why some people can get the radio to work while others can't - we're using different radios, why are there two different versions included and which one does the mogul use?