Then, in your view, the "real" James the Less simply disappeared at some point after the last reference to him in the Bible ... unknown to Eusebius, unknown to history, unknown to Christian tradition ... vanished?
I repeat: Eusebius knows about two early church leaders named "James". Only two.
We know that the James of Mark 6 is not the son of Zebedee, because Zebedee also had a son named John, who is not named in the 4 brother list.
We also know the James of Mark 6 is not the son of Alphaeus, because Alphaeus also had another son named Levi (Matthew) who likewise, is not mentioned in the 4 brother list of Mark 6.
So the James of Mark 6:3 must be at least a THIRD James. (At LEAST).
First, Last and ONLY reference.
I merely asked IF there were any supporting evidence that the two were one in the same. So far, I haven't seen any.