Hagoromo states that giving only Asura power resulted in a feud, and then in the present he says that giving both reincarnates power resulted in the same problem.Your interpretation is worse than mine.
He didn' t say that he gave them power, he said that he left them power and there is a nuance, the latter doesn' t imply that he did that intentionnaly.
Only Indra had power, only Indra was left power, the sage was talking about Indra, and it is obvious for good readers.
The manga states he gave Asura power, it's in the manga. You can't deny manga facts.
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