When we talk canon here it has to be made clear that the Silmarillion is not canonical because it was not written entirely by JRRT, we do not know when he stops writing and CT starts 'editing'. So if we wanted to get technical, as long as it isn't in conflict with LotR it could potentially be ok, the problem arises when there are many versions, the only thing we can say is that the latest version is probably the most correct to Tolkien's final vision.
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