...What if Agito defeats Klumeggnigg/Jabir (pretty much a given by now)... shrinks back down to Guyver III... and that is the moment Guyot strikes? With the Remover?
...Problem: how to get rid of Griselda and the Libertuses. Answer: well, he presumably still has his gravitonic abilities. He only has to hold them off while he absconds with the Unit. And if he still has some Unuses at his disposal...
Then, Guyver-Guyot would confront Archanfel...
If Guyot defeats Archanfel, the ultimate battle will be between him and Sho.
As this is going on, Apollyon takes on the remaining Zoalords, with the next-to-last battle between him and Galenos. Epic fight which Apollyon ultimately wins; now he wants to move on Archanfel, but there is still one standing in his way: Hamilcar Barcas, Barcas finally takes on his battleform, revealing he can only do this once ever.
So Barcas and Apollyon throw down, with the Zoalord being the ultimate winner at the cost of his own life, but as he dies, he is happy in the knowledge he successfully defended Archanfel - but right after he perishes, Guyot attacks Archanfel.
The ultimate battle should be on the Moon, or maybe even Mars, as both Sho and Guyot want to spare Earth, although for different reasons.
Of course, after the battle, in which Sho should probably be the victor (but knocked out / cocooned), we see a spaceship on a course for Earth... and as we get a look inside, we see an army of Apollyons!