Dragon' Den in the SNES version

That too as well. I am not planning on replicating because it would be too difficult to make, but I wanted to know if there were limitations on a snes rom that would prevent it from existing. the gba port being 32 bit would have less limitations because it opens more coding combinations right?

as for the summons, well you do need the 4 of them although Gilgamesh could replace raiden if there is an esper limit.