As I said it's not just facial expressions, what you said does not counter what I said since I implied that there is a combination of more than one factors. Yes, that conclusion was mine alone and just as I said it's not the only that triggered my attention, even if it's not the case.
For the record, I never once said it was only facial expressions, so I understand your thinking doesn't come from just that. The point is you continue to use it as your "credible evidence" right after saying you don't use facial expressions alone. I find that contradictory, even if it's just one point of several.
Your second point is just your interpretation as well. You may say that Hagoromo learned it at that exact moment but let me pose you the same question: how did you come to that conclusion? As far I'm concerned, all I see is an old man who doesn't get suprised by anything. The lack of suprise can also mean knowledge. Besides, if Hagoromo was "alive" this whole time, it would be really suprising to learn something as big as that just now. How can you tell that he didn't aqcuire that knowledge in the past? Can you disprove it? Ofc not, it's only a hypothesis.
No, it's not an interpretation. It's what happened in the story. Hagoromo said he sealed the Juubi, not kaguya. Later BZ stated he didn't know in reality he sealed Kaguya when he sealed the Juubi. Previously we were made aware Hag is able to see what goes on in the lives of Naruto and Sasuke. After the battle, he congratulates Kakashi on his leadership further proving he saw the fight. As you can see my conclusion is based on actual events that happened in the manga, not how I think a certain character felt at a particular moment or meant when they said a certain line.
3rd point: I did not suggest that he appeared in the real world due to his great power and I do know that there was a perfectly logical explanation for that.
Pretty sure you did, whether you mean to or not...
Not only that but supposedly his role had ended at handing them his powers, yet we saw that he can appear in real world, using his great powers, only to run out of juice when Sasuke conveniently starts his revolution.
Whatever, not important.
Still what interests me is the fact that he actually reappeared with quite some power, enough to summon back all the kages and then all of them together the beasts and the team. You could say that he somehow got power from Madara's jin body but whatever. All this power however suggests powerful chakra and the way he was at a rush when he was explaining things at Naruto, leaving btw Hamura out, out of fear running out of chakra, comes in contrast to what he did lately.
You're drawing, again, a conclusion with no "credible evidence". What in the manga indicates it takes a lot of power to do what he did? Clearly since he was summoned into the world, he is now a link between the pure and impure worlds. How do you know he didn't borrow the Edo Kage's power? Alternately, we've also seen Edo Tensai that summons a spirit into a living body. Was this jutsu ever stated to need large amounts of power to preform? In fact. I believe it was the opposite.
Also he didn't leave Hamura out, if he did, we wouldn't have known about him until Kaguya appeared. Just because he didn't give Hamura's life story doesn't mean he's hiding anything, just that it's not relevant to the struggle between his children. It has a lot more to do with Kishi's writing than Hagoromo's intentions. After all, Naruto or Sasuke didn't ask about Hamura either. So until he's asked and then avoids the question or talks around it some way, you can't say he's hiding it.
4th. So you suggest that the kages was something that could be done so easily while some chapters ago he was such a rush in order to tell everything before his chakra runs out?
I didn't suggest that summoning the kages was easy until this post, but okay. Even then I'm not saying it was easy, just saying it didn't take a lot chakra specifically to do it.
Plot is one way to look at it. As for the no reason part, I have a theory: he wants first to see the results of these successors. All this time he was only trusting Ashura's, now both of them, the results seem to be the same. If that's the case he might want to see Indra's successor winning and see his results, and if thsi third and last scenario fail, he might want to become active again, don't ask me how, he's the sage, by claiming the power of both of his sons and rule the world in his own way.
Your theory flies in the face of Hagoromo's words in this past chapter, nor does it provide a reason for him to feign helplessness. I would think if he wanted Indria to win then he would do something to empower Sasuke or weaken Naruto. However, he's still watching what happens after giving both Ashura and Indria power. He's just standing by and baring witness now to see the conclusion of giving them both power. Maybe that's why you feel he doesn't care.
Finally I just want point out I'm not saying that my conclusions are inherently better than yours or even that my evidence is more credible, even though I believe they are. I just take objection to you inferring I'm not using "credible evidence", when clearly you aren't either.