What are the leading theories for how the Jesus paragraph in Josephus was inserted into his ANTIQUITIES text?

When was the insertion likely to have been made? And is there any evidence that any portion of the pericope was originally part of Josephus' text?

I realize that there is a second text in Josephus that briefly mentions Jesus but I'm talking about the more famous passage.

[I'm a Bible-believing Christian so this is not an attack on the historicity of Jesus. But I consider the evidence weighty for the Jesus passage being a later addition.]
 
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