1. No, he doesn't talk differently. He refers to humans differently.
2. You're the blind one. His face is exactly the same, his horns are obviously broken, his hair is the same accounting for it being free instead of in a ponytail, and obviously he wouldn't have a third Rinnegan because he no longer is fused with Kinshiki. In fact, he looks so much like Momoshiki that Bolt thought (knew) it was him.
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3. You're simply mistaking a new character for Momoshiki's soul. If it is his soul as I say, then it is similar to when Hagoromo met Naruto and Sasuke. He can manipulate how the scenario looks. Besides, the wind was shown moving, so obviously time did not really stop. He didn't even turn invisible, Bolt just didn't look at the right place.
Black Zetsu's method is to revive the Ten-Tails and give it a host so that Kaguya can reconstruct herself. Since the Ten-Tails is currently dead, so is she.