As for the other changes, it was probably that the feedback from the blood drawn from the Battle Maniac Asura had been completely digested, with no need for time-consuming digestion.
The digestion of that feedback naturally led to a significant increase in the Performance Coefficient of his body. As a standard value for humans, ten points of strength could only bring about ten points of effect, but now ten points of strength could bring about an effect of fourteen points. However, he had just shed his skin, which greatly reduced his physical performance.
With an increase and a decrease, there was basically no change unless his body fully recovered. These were truly the characteristics of a Supreme Demon... Therefore, if one wished to become stronger, ceasing to be human was the fastest way.