James and John are Castor and Pollux because Helen was the sister of the Dioscuri

[Giuseppe]

It can't be a mere coincidence, that Magdalene is found in the same story with James and John
(Magdalene being obviously Helen).

So prof Dennis MacDonald is correct in their identification, if a further evidence was necessary.

[lsayre]

What further testimony do we need? For we have heard it ourselves from his own mouth...

[MrMacSon]

For we have heard it ourselves from his own mouth ...

From who's own mouth? Which passage?

[lsayre]

Obviously you didn't get the joke.