Didn't Karin say sasukes chakra was colder then when get used the curse mark when he used ms, and tobirama said special chakra comes from the brain when the sharingan is activated,when sasuke used susanoo every cell in his body was effected and as it developed his chakra changed, stronger chakra = overall boost ex.modes such as sage mode (becomes stronger due to chakra being enhanced ) and kcm. It only makes sense that sasuke's strength and aSPEED increase, which it has.Also hashirama's dna could've also augmented him. ♤♜◆??????????????????