This idea is absolutely awesome. It's a very creative challenge. But it looks really complicated to keep all the classes, which GF's they are represented by and their abilities/restrictions in the head. xD

Also, FF8 is more heavily dependant on Limitbreaks than any other FF, so I can easily see how the classes that allows "Renzokuken" and possibly some of the other's Limitbreaks will become the most powerful ones. In the worst case, completely overshadowing other classes.

...how about banning Renzokuken completely? xD Of course, it might not be quite that bad thanks to other restrictions (I haven't tried this challenge, so I wouldn't know).

Also, since Odin/Gilgy are both random and allows no junctioning, how can you use them for possible classes?