You didn't answer the question about the two cherubim covering the throne on the Ark. Those four cherubim/four living creatures are easy to identify, however bizarre they look like, their job was to carry the throne around, as the Ark was usually carried by four men; but those two "covering cherubim" are still a mystery.
It is my understanding that it is part of the duties of all four Cherubin to surround the throne of God. Why the ark showed only two of them without naming those two is certainly a mystery that scripture does not solve.