This is my first time on this forum, so I might screw it up a little, but anyway I appreciate all of your comments. Here we go.
If you remember the final boss fight in the first Parasite Eve (Ultimate Being), then you already know that to defeat it, Aya had to use the bullets which was laced with her own DNA, since every hit was evolving it further.
What if even the laced bullets didn't work? How far the UB could have evolved and what would be its capacity?