hiruko waill abosrb every tach itachi has and is to fast for tsykuyomiPain and Itachi IMO
he's to fast to be caught in those techniquesPain can just steal his soul or steal all of his chakra and then it would be game over for Hiruko, and I don't think that Hiruko is immune to Itachi's genjutsu either.
The Swift Release (迅遁, Jinton) is an advanced nature kekkei genkai that can be used to move at virtually instantaneous speed, granting the user an advantage over opponents with more strength than speed, such as users of Chakra Enhanced Strength. This nature therefore renders the user invulnerable against taijutsuyou cant absorb shinra tensei, and he isnt that fast that itachie cant trace him. you also can absorb chbuku tensei. if naruto can kill so can nagato and itachie
he's to fast for tsykuyomi and steel release is definatly leaving a huge crack in susanno even making the strain on itachi worse making him closer to near deathItachi get him under a genjutsu then Pain take his soul and end of the fight.