Indra didn't develop ninjutsu, he was just another follower.
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As Madara explained in the manga it was the humans who were bitter with hatred that shifted from Ninsuu to Ninjutsu. We don't even know if the first one to experience hatred was Indra. That is a question you must save to ask BZ.
the article about the secret of ninjutsu in the last DB stated that Indra used his genius to turn Hagoromo's teachings into ninjutsu. What Madara read about that was most likely part of BZ's editing job.Indra didn't develop ninjutsu, he was just another follower.
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As Madara explained in the manga it was the humans who were bitter with hatred that shifted from Ninsuu to Ninjutsu. We don't even know if the first one to experience hatred was Indra. That is a question you must save to ask BZ.
Technically, Indra was the one who used his powers for ninjutsu. So I'll say he is the first user (excluding Kaguya). People later followed Indra's footsteps. Much like Madara was the first one to defect, the rest of the Uchiha clan later followed.
The senji clan and other clans created far more ninjutsu than the Uchiha clan. tobirama take the major pick. Created edo jutsu. But The Uchiha clan used their sharingan, taijutsu, and bukijutsu to fight. other clans used ninjutsu more. So really can't say Indra used ninjutsu first.
He used chakra for power "first", so he is the inventor. Others can surpass him later.
Since Indra lost the fight, Wouldn't everybody sided with Ashura? When your leader lose in term of ideal, majority of people would go to the opposite side. If the senju clan know the history, they wouldn't try to make dangerous ninjutsu such as edo tensei. I just think there was other people using ninjutsu before Indra and so.
Indra was the god that invented Ninjutsu. Databook says this explicitly.
This is pretty incredible seeing as Ashura got Hagaromo power up( yin and yang half) and Indra after inventing ninjutsu was able to stalemate him.
Just made Indra even more badass! Redefine shit to stalemate his father's power. Ugh!