Makes sense. So indra side > ashura side.Ashura had some Juubi chakra hence why he was able to use RSM, but he needed NE to activate it while Indra relied on his own chakra.
And Ashura's body gave his descendants the ability to either be jinchuuriki or absorb NE, but in either case they needed an outside source of energy to match the chakra of Indra's descendants.
MS > Senjus (without external powerups)
But what about this ems and rikudou chakra. Is this not external? And wasn't senjus v uchiha equal rivals?