I'm guessing the goal is to see if better performance in driving softsynths can be obtained by using zita-j2a to handle output rather than using jack directly interfacing with Alsa. I don't think it was intended to be a jack1/jack2 match off. To me it seems like an interesting experiment, and I hope Jonathan keeps up the tests, despite the so far only negative feedback. 

One of the fun things about being an ignorant user is to sometimes try stuff out just for the heck of it and find things even the original creator of something didn't intend. If people only followed rules, entire genres of music wouldn't likely exist, so I say bring on the experimentation. 

absolutely agreed.