You can't change the mechanics of techniques to fit your fanfic m8.
They were considered the only ways because they are the only things that would work against the tsb.
I'm not changing the mechanics of the technique.
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What is stated is that techniques based on Onmyoudon turns ninjutsu into nothing. That never implied that Onmyoudon used as an extension of your body does the same thing as your body itself, cannot be a technique.
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Hell, it seems you're denying the manga. It was the fact that Juubito withstood the attack with no visible damage that Minato made the statement of him having the power of his dreams. Likewise, Tobirama also stated that hitting him has no effect.
It seems you're dodging my points though. If you truly want to make an argument, then tell me why Naruto and Tobirama observed that Onmyoudon didn't enable him to nullify Senjutsu and thus used that same observation and applied it to actually damaging his body. If Onmyoudon wasn't applied to his body, that observation would've been pointless as TSB's vulnerability to Senjutsu wouldn't have applied to Juubito's actual body.
So anyway, according to your fanfic, since physical attacks work on a jj, if Tobirama punched obito in the face, would he take any damage? The attack is physical, but edo tensei is ninjutsu.
He would take damage if the attack was strong enough as Taijutsu and Senjutsu was implied to be the only thing to be effective as stated here:
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Note how Minato words it was, "Physical
damage from Taijutsu." That in itself implies Minato was referring to damaging Juubidara's actual body here.
Why did obito use his gudodama to block Sasuke's amaterasu the first time he used it?
He used it to "douse" the flames. He likely brought it back to him because it's his signature ability. That doesn't refute the fact that Minato and Tobirama made their statement after Juubito tanked the attack with no visible damage.
There was never a single word said about "nullifying the effects ninjutsu has on the body" in the manga.
Take your fanfic somewhere else, kid.
There doesn't have to be unless you need everything outright stated to you.
Fortunately for me, I brought statements proving my point.