By the time the Good Doctor took over

Although this passage appears in every version of Egderus' Writings, it presents a problem of logic, or at least of sequence: how did Egderus know that the Historian 'invoke[d] this supposed friendship early on' if he himself knew nothing of the Historian at all until after the Historian 'gave up' talking about the Golias? Perhaps this is another case of Egderus saying, in effect, 'I don't really remember, but this must be what happened.'