In the latest chapter sage don't talking about power although he said everything there, instead he maybe talkìng about trust, leadership, teaching etc but not his power.
why needèd the sage give his power for? For what? There are no kaguya to fight but the trust sage give to ashura after he saw ashura archivement make indra jealous hard.
after that the war between them continue to prove whose believe is right for ninshuu leadership, the war that happen until they both died. But their chakra is still alive to seek successor to carrieď out and fulfill their believe.
But in madara case, he is turning out to different way as state by hago, that mean ìndra believe is stop at middle of the road because of madra is following kaguya path, that mean indra chakra tried to finding another candidate. Because two chakra from transmigration cant cooperate in one body because of different in believe.
that mean although part of his chakra is assimilated with ashura to form hago chakra, but indra chakra manage to escape and find new candidate to carried out his believe
Also maybe in time of indra and àshura is still alive and in war, bz tried to corrupt indra to follow his plan of reviving kaguya back after he is loosing ninshuu leadership war, but indra with his believe put off bz calling and plan,
but bz plan to corrupt indra is done in non direct manner same as madara situation, thàt mean by using the tablet.
but back to this brothers case, indra after ignoring bz attempt still continue fued with ashura as the name of believe and unfairness and hatred or grudge at hago and ashura.