Gege never had the ability to spread over her portals at the places of Arthur's forces. She didn't lack the control over portals or the numbers needed to even surpass those of the dark angel mage.
However she had no such access to their locations to begin with. Arthur realized this from the start and so he decided to go for such a bet.
And his enemy just fell directly into it. Based on the recent exchanges between the two, Arthur would never make such a mistake of gambling with his enemy.
So the dark angel mage didn't see through Arthur's plan and fell directly into the trap.
"Boom!"
And now all that remained was for Arthur to take all such wrath by the help of Gege, while leaving his original to crush the remaining shields.
Plus…
"Divert them all over there," Arthur finally was satisfied with the immense number of lightning bolts descending over his head, "I suppose it would be enough to crush this portal for good."
