The Common and unclean animals were seen in the vision of Peter's
Right, because he sees all kinds of animals
and on it were all kinds of four-footed animals and crawling creatures of the earth and birds of the sky.
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He said he had never ate anything common or unclean.
Right, though there's a textual question about whether it's common OR unclean or common AND unclean
But Peter said, “By no means, Lord, for I have never eaten anything unholy and unclean.”
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But let's assume it's supposed to be OR and follow that out
Then God said, what God has cleansed call not common.
Right, what God has made clean (katharos) don't call common (koinos)
Not only are two different animals being seen in the unfolding.
Actually, I think it says all kinds of animals
So those that were clean
Those that were unclean
Those that had started out clean, but had been made common maybe through touching something unclean?
So three categories, it looks to me
But it is also worthy of a mention that God never addressed the animals that Peter seen which were unclean. He only mentions cleansing the unclean.
It looks to me like God is referring to all animals, since that's what was in the vision
πάντα τὰ τετράποδα (all four-footeds, so that would be tetrapods that were clean and those that were unclean)
καὶ ἑρπετὰ τῆς γῆς (things to crawl on the Earth, I think those are all unclean)
καὶ πετεινὰ τοῦ οὐρανοῦ (birds of the sky, some of which were clean and some of which were unclean)
I'm using clean and unclean above with reference to Leviticus 11
It looks to me like God is addressing the unclean animals that Peter sees as well as the clean ones. That is, God has cleansed them (katharos)
One should notice that in the seeing of all manner of four footed beasts and what not; not one animal was seen that Peter could eat.
Well actually, some of the tetrapods would have been clean (katharos), unless something has happened to them to make them common (koinos)
With that in mind, what made the clean animals not fit to eat in Peter's eyes?
Possibly because he saw them in close proximity to the unclean animals? They were all in the same sheet? Peter was steeped in the traditions of the Pharisees, those things don't go away overnight. For example, Paul shaves his head to keep a vow
Therein is the answer to your questions.
Well, since it looks like we don't agree about the details of Acts 10, I invite you to explain more
I'm especially interested in your take on Romans 14:20 about all things being clean.
But maybe you've answered that recently, and I just haven't gotten to that post yet