Supreme Thief had stolen countless techniques throughout his life. All of them carried an aspect or the existence's core of cultivators and hybrids, so he could find something suitable for Wilfred and Steven.
Wilfred's issue came from how simple his existence was. He only cared about his physical strength, so he had instinctively developed long-range techniques that allowed him to send that immense force toward his opponents.
Still, mere physical power wasn't enough to reach the ninth rank, not when it wasn't at the true peak. Noah was already stronger than Wilfred, and Alexander could overcome him in that field through some abilities.
Supreme Thief had to add depth to that power. He had to make it worthy of the ninth rank, which involved smarter ways to apply physical strength. He wouldn't give Wilfred anything too complicated, but the hybrid had to learn how to deploy his ability correctly.
