Tenma was not woken from his slumber. Prime saw no reason for him to do so; there were too many higher-dimensional rules being wielded here, and it might lead Tenma into madness if he were to witness too much of it.
Accessing his Spell Library was easy for a Weaver of spells like Prime, and he chuckled in appreciation at the depths Eva and Tenma had gone through to refine the Akashic Gate to this level. He could appreciate good work when he saw it.
Rowan's Primordial Sea of Darkness had been gathering Angels of Char without his intervention for hundreds of millions of years, and before their destruction, he had assembled seven hundred billion angels.
There could have been more if he had chased to draw upon the power of the sea of darkness, but he didn't, and it was a good thing because if he had been greedy and sought more angels, the power of the Gilded Maw Spell would have been too powerful for even Rowan to endure.