Recruiting foreign Awakeners was a soft approach, but Leon did not make the suggestion because he was afraid of erupting into direct confrontation with these foreign Awakeners that would inevitably come to their Capital. The suggestion was made in consideration of humanity's dwindling population.
If they could benefit from reducing the killing of their own kind to a bare minimum, it would be for the best. But if the foreign Awakeners don't know what's good for them, Leon did not mind washing the Capital in the blood of his enemies alongside his mother. The Crawford royal families weren't pushovers.
"Speaking of the crystals, I wonder if you have any idea about the its origins or how it came into being, mother?" Leon suddenly asked.