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You never know until you try. But in the event that their presence doesn't yield much difference, they should use the alternative plan in order to weaken Kaguya.
The problem might be that Hagoromo's power is just the fractured half of a single whole. From the account given about the conflicts that ravaged the continent when the Jubi first existed, the two children of Kaguya fought the Ten-Tails as an act of penitence for their mother's crimes. Now if you subscribe to the theory that the siblings challenged Kaguya herself, it would suggest that they had the power to match her strength; similar to the current state where Naruto and Sasuke were able to stave Madara off. That could be the missing piece to beating her. Ashura and Indra were only segments to a halve of a whole puzzle. Instead of having the necessary 50% power to tally up and equal Kaguya who represents 100% of the Otsutsuki's power, they only have 25% each. How that translates into their combat skills is that their speed, strength, and acuity are child's play to this being (with 50% each they could at least hold their own).
I think you might be right about Hamura playing a part in this. His knowledge and gifts are what Naruto and Sasuke need to overcome the final benchmark in the line of succession which is the Sage of the Six Paths himself and his brother. Overtake them and you have a chance of beating Kaguya (unless they choose to take another approach that was suggested).
True you'll never know until you try. However just like ramenanmitsu said the Edo Hokage's weren't a match for Obito when he was the Jinchuuriki of the Juubi. Now I want to say something similar to what you said about percentages. The way I see it right now is: Naruto+Sasuke=Hagoromo; Hagoromo+Hamura=Kaguya. Just like you said Naruto and Sasuke only have 50% of the power needed to defeat Kaguya.
Maybe really amazing strategy and working together coming from everyone will be enough to equal the remaining 50%. But I doubt that.
They need help desperately.
