The bible verse said that the beast was made out of the 10 horns of 10 different nations, not that the ten horns came after the beast.
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7After this I saw in the night visions, and behold a fourth beast, dreadful and terrible, and strong exceedingly; and it had great iron teeth: it devoured and brake in pieces, and stamped the residue with the feet of it: and it was diverse from all the beasts that were before it; and it had ten horns.
No, the bible verse does not say that the beast was made out of the 10 horns. It says it HAD 10 horns.
Actually, 11 horns, including the little horn, which came up among them. See post 45.