To forcibly increase the total amount of spiritual power is not an easy thing. If each qualitative change requires a bit of talent, then raising the total amount demands relentless diligence and long-term accumulation. Xu Huo meets neither condition; firstly, he hasn't been evolving for long, and secondly, his evolution rate can't be increased at the moment—he lacks the necessary hardware.
Six years ago, Bai Kou was just in her early twenties. If she had already begun super evolution then, she'd be unquestionably a talented one. Of course, looking at the results now, she is indeed exceptionally gifted, so young yet already a Rank-A Player, and at minimum a Dual Super Evolver.
What comes easily to her isn't something others can necessarily imitate.
