After returning , he did a test to become special jounin first ,
then after he continued to increase his shadow control ability to make it strong enough to cover the whole Village
During this time ,other than training and mission , he spent his most time-fighting.
Life doesn't go the way you want , in this year there was no interaction among shikai and ino so there was neither love or hate just a simple friendship
Shikai too didn't want more from Ino because he finally sorted out that only strength and battle can give him thrilling experiment and strong women but,
speaking of strong women in his generation there wasn't any in the leaf village
time passed 1 month later Nightwalker and Gratos returned with some more Jounin shadow , which helped Shikai making his shadow 100m wide in normal condition so he had to compress it as his body size to make it more and more perfect
finally, 5 months later, Shikai met another Kage level expert, but this time he only extracted a little chakra
so the remaining chakra of kage, he absorbed it in his shadow giving him a mysterious feeling
He again tried that with jounin shadow and again felt the feeling but a little less than before
so with experiment with the shadow and the mysterious feeling, he got the conclusion that this feeling is the feeling of natural chakra of shadow world
this result showed him that Shikai now can finally be the character to be afraid of in the future because he was a factor who can even kill pain if he masters this technique.
but he was not Naruto who was made for the sage mode
so he didn't take the route of Sage mode but a different Route, that is to get drunk with this mysterious feeling until your body become one with it,
and as he is always very near with shadow world ,
he can do it every time so he sent 100 shadow clone to the shadow world for the baptism
he finally managed to make 100 shadow clone after reaching 13 level
this purification process of being one with the shadow world was the longest Shikai experienced calculating the time 100 shadows has been doing this for a month already which result in 8 yr of training but he only managed to scratch the surface of this power
With this training going on for who knows how long
Nightwalker and Gratos had earned a reputation in the Ninja world giving them the title -Twin Devil
Nightwalker also reached mid-level kage 13 and gratos increased to 14.
time passed it has now been 1 year and 8 months since Naruto and Sasuke left the village .
Shikai is now level 14 and his shadow's had gone to level 15
Ino-shika -cho reached 7,8,8 level respectively,
Kakashi had gone over the bridge reaching level 10
Asuma stayed at 9.9 only needed a little push
Guy reached the power of 9 with only 4 gates open so if the current guy open 7 gates he can fights the super level already
Neji reached 7 levels respectively with Tenten being 6 and lee was also level 7 if he opens all 5 gates and level 8 if open 6 gate, which is his limit currently
with all this said , almost everyone had become strong in just two years having the power level of jounin
in this time Shikamaru taught Shikaku uncle how to perform shadow spike but shikaku changed the spike into a needle making his shadow like needle that is able to fly with the support of string-like shadow
with this improvement, shikai was happy because this way ino shika cho just wont be supporting type but a full force even if they are alone
being said that his love life hasn't progressed yet .having a blond hair fetish he has a very limiting choice but he want the best .once again he applied for the jounin test where he took time because he again killed a kage level expert and roamed around cloud and stone village being undercover
finally he was approved to be jounin , although some were against it like Danzo who now very much wanted to bring Shikai under his control but how could he
every people he sent after shikai has disappeared so Danzo thought Hokage has been behind shikai.
Everytime he invites shikai he was rejected, he once even tried Kotoamatsukami but it was broken before it penetrates the chakra barrage of Shikai ,.
to this incident, Danzo thought that Kotoamatsukami failed due to it being not practiced enough
that night root was hit hard by Night walker and Gratos but Danzo couldn't do anything because he didn't know who nightwalker and gratos are
he suggested Hokage to release a wanted poster for nightwalker and gratos but was rejected by Tsunade saying"bring me proof , i don't want to make those kage level expert enemy of leaf village "
Since then Danzo was trying to find proof about Nightwalker but this was known by shikai so he again raided the root getting Sharingan eye which was stored
he emptied all the Sharingan , he didn't want them but who knows where it might be used
after taking Sharingan he left a blood note stating" try to find me again, i will even take Shusui eye "
Danzo was fearful of the unknown and more afraid to lose Shusui's eye because it was his trump card so he stopped the process of searching nightwalker who was like a ghost for him.