Leon though he would have to deal with some headaches while convincing humans and Tyrselle's soldiers to work together. However, only a couple of individuals protested for more than a few minutes. The vast majority of the humans didn't dare to oppose their leaders. Gisela was a symbol of discipline; Yuki has been the empress for nine hundred years. Meanwhile, Hector has been working hard to protect his followers for the same amount of time. As for Tyrselle's soldiers, no one protested after she made her choice. It wasn't because she was powerful or an authoritarian leader, it was because they had faith in her.
Another fact that shut up the protesters was the feeling of awe those who became part of the Reverse Mana Link showed. They obtained access to an almost seemingly infinite mana pool, after all. That alone was enough to convince even the most stubborn of the protestors.