I understood your point. But still, it's hard to believe he got rid of the amaterasu just by taking the armor off.
At the same time, why would he take it off?
That whole scene is very confusing. We don't know for srue what he did there.
Alright, see right here before he used kamui, his face and hair should of been burned:
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Madara had a smaller version on his back for s long as Obito did too.
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before Obito kamui-ed it to other dimensions, and like-wise Madara took off his armor.
Both the Uchiha's are suppose to have burned hair...
My solution is that with senju dna, they were able to heal that quickly.
Your entitled to believe whatever you want, i'm just saying what makes sense to me.