He's using Ningendo and Shurado in the picture. Not Gakido.
Nagato was using multiple paths at once
But Seriously, Nagato didn't absorb amaterasu
(which is easier because there is no 5 seconds
limit)
Nagato did not absorb itachi's susano when itachi
attacked.
Why didn't nagato absorb itachis susanoo attack?
Why didn't nagato absorb itachis amaterasu?
Could they actually be DOUJUTSU(eye techs)
Amaterasu cannot be absorbed cos The preta path has only been shown to absorb chakra based and elemental ninjutsu. Although amaterasu is a fire jutsu, i believe it cannot be absorbed cos
1. It is said to be black flames summoned from hell and we all know preta path cant absorb summonings.
2. It is a mangekyo doujutsu therefore it is not created from the combination of physical and spiritual energy as in chakra based fire jutsus.
3. The black flames eat anything from chakra to fire to flesh and all solid materials so even if the preta path activates the absorption seal before amaterasu is cast, the flames would just burn the seal and then burn the preta path.
4. If amaterasu was absorbable, nagato wouldnt have used shinra tensei instead of absorbtion jutsu