The only problem with this plan was that even if he was able to cleanly kill Ascendants he would not be able to crush their soul mountains. Nevertheless, even if he was incapable of excavating the memories of the soul without his complete consciousness, he would find other ways of gathering information.
Another stream of soul energy congregated around Rowan, and with a mental push, he shoved them away. He was not taking any risk in consuming any of the souls on this continent at this time. Ascendants were closer to their soul form and it was possible that the Divine Ascendant resting in his palace a few thousand meters away would be able to sense the dissipating soul energy.