There are always exceptions.
How convenient.
Point is, if most mythical characters have obscure origins back in the mists of time compared to the earliest attestations then this is a relevant factor and one that Carrier leaves out of his 'probabilities'. It applies to most if not all of the others on his list.
I don't see how this is supposed to be a big issue. Most of Lord Raglan's profile is intrinsic. Date of attestation is extrinsic, the opposite.
So we have an interesting conundrum. Why do Jesus Christ's biographies make him seem like someone who lived centuries before when he allegedly did?
The Gospels of Matthew and Luke make a big fuss about how he is descended from King David, and that's what counts.
His Father wasn't a king. That is the criteria. Sorry. Giving him a full point is ropey.
Even though he lived as a commoner, his royal ancestry was nevertheless an important issue. Why might that be?
Curiously, he's made out to be reproductively cuckolded by the Holy Spirit. Although Jesus Christ could have been like the legendary hero Theseus, someone with two biological fathers whose semen mixed.
As is giving him a full point for 'reigning uneventfully'.
JC didn't have a lot of drama in his career as a religious leader, at least compared to the two ends of his life. What would you consider big drama? Arguing with Pharisees? Denouncing them?
Arguably also 'becoming a king' since there is arguably a difference between being a failed and unofficial claimant with some supporters and actually becoming king.
Only if one is too literal-minded about being a king. "Great leader" seems good enough, and it fits.
When scoring JFK, does one count against him that being US President is not quit being a king?
Perhaps even 'prescribes laws' about which the assessment you linked me to says, 'His teachings qualify as laws in an informal sort of sense' yet still gives him a full point.
His teachings include instructions on what to do and what not to do -- which is what laws are.
Why even a partial score for 'raised by foster parents' and 'Royal (virgin) mother'?
Jesus Christ's parents fled with him to Egypt. His mother was his biological mother, while his "father" was essentially a stepfather, but one that gave him claim to Davidic descent. Also, Mary doesn't have anything notable about her, except if one interprets one of the Matthew-Luke genealogies as referring to her. But JC is her first or only child, something typical of legendary heroes, something that made Lord Raglan come up with the virgin bit.
Plus, even Ralgan, apparently, admitted his 22 criteria were arbitrarily chosen in the first place.
Where?
"Dundes noted that Raglan himself had admitted that his choice of 22 incidents, as opposed to any other number of incidents, was arbitrarily chosen."
https://en.wikipedia.org/wiki/Rank-Raglan_mythotype
I think that he wanted something manageable, so he used what seemed like the most important sorts of incidents.