Re: harmonic balancer on transfer case....
Yup, my Rubicon had one too. Didn't need a SYE as the splines are already in the shaft, but when I lifted it I took it off and used a CV shaft.
Hasn't seemed to be detrimental, although it may have a small vibration that it otherwise wouldn't have. Can't really tell.
Great to hear from the original developer! Wouldn't it be nice to hear from other guys that were in on the designs of things? Sure would answer some questions as to "Why did they ---."