KG, Hagaromo teleported team 7 including Sakura who didn't have his chakra back from Kaguya's Dimension, can't he just do the same in battle?
He did that via Summoning Jutsu....so no, he can't.
I don't see how Kaguya is defeating a prime Hagaromo, considering two halves of his chakra as a ghost posed a big enough threat to make Kaguya want to seperate the two. Hagaromo having his Senjutsu, as well as Goudama and the speed of a Juubi Jinchuriki should be capable of evading or defending from her ashbones. His CT would be enormous, he has COAT, superior regeneration based off of Madara and Naruto's feats.
Simply because Hagoromo stated that she was above him. No point trying to argue it by feats when he admitted inferiority. Her separating Naruto and Sasuke was because they are hard to deal with when together, that doesn't mean they can beat her together, because the manga showed that they needed help.
But if you really want to get into feats, she'd still take it.
-His CT is countered by All Killing Ash Bones.
-His Gudo Dama get destroyed by All Killing Ash Bones, or their defenses are broken open with her chakra fists.
-Gravity Dimension+All Killing Ash Bones=A Dead Hagoromo. He can outright evade the ash bones otherwise, but he isn't blocking them with any known defensive technique he has. Gudo Dama can't negate Kaguya's jutsu as Rikudo Chakra can't be negated, and she has that as Hagoromo got his chakra from her, and she is the Juubi, and the Juubi is another way to obtain Rikudo Chakra.
-Creation of All Things isn't battle based.
-She should be faster than he is, Teleportation just makes it worse.
-Superior regen means nothing when Kaguya can kill him with one ash bone.
That isn't even powered up Kaguya who was giving Naruto and Sasuke trouble. Once she's powered up, she can create a Gudo Dama that was hyped to be strong enough to bust a dimension. No way is anyone in this manga beating her one on one. Too strong.