Sai-how'd this boi get so strong?

[Yes. He hasn’t learnt even a single bit of Sennjutsu at all. That is a Touki which has awoken after he continued to train his taijutsu[23]. His body which pursued for pure power gained a power different to demonic-power, and it is the base of life itself and he is wearing it around his body. You can say that the excess vitality and life force within him has spurted out and made it visible.]

So Sairaorg-san gained a power different to demonic-power by training, and he attained pure waves of power onto his body………!