Leonel didn't seem to be enraged. It was more so that he had already expected as much, it was an inevitable end. Everyday he seemed to be learning about fascinating and great things, but too often these were matters that others were fully aware of, or could have been explained to him long ago.
The fact that Wise Star Order mentioned going to seek out a second Tablet after he had enough strength was enough to prove that he at least knew something about these matters, enough for him to be ready for everything Leonel was prepared to throw at him.
Wise Star Order was correct, Leonel had overestimated himself. Ten million minds mind sound like a great feat and an enormous number, but one had to remember that the gap between Dimensions was akin to the difference between mortals and Gods. By the Fifth Dimension, millions probably shouldn't even be considered a large denomination anymore.