User blog comment:Jona19992/Third Holy Grail Hypothesis/@comment-1458758-20190407084622

There was an Archer. In Hollow Ataraxia, Avenger recreated events from the 3rd war using the saint graphs from the 5th. So over all there were 8 servants, because the Saber container wasn't split until after the summoning thanks to the Edelfelt's sorcery trait.

In the main timeline, we can assume one of the Edelfelt's made it to the end cause Sabers always made the final two, with the Tohsaka taking the other slot as a finalist since weakling Avenger was eliminated early on.

In the Apocrypha timeline this is completely turned on its head with Ruler and Lancer seemingly being the two finalists and the founding families left in ruins.

Assuming Faldeus' relative (Who I'll call Dioland for the sake of it) was affiliated with the Clocktower or already with the American association, then it's unlikely he's the master affiliated with the Imperial Japanese Army, so our missing member (Archer's master by your reckoning) would then be the one affiliated with the Japanese. This fits with the Koha-Ace interpretation of the 3rd war where the IJA took control of the Grail thanks to their Archer, Nobu.

Personally, I like to entertain the idea that the archer was summoned by the Tohsaka, just to hold pattern alongside the Irish Lancers, but I admit I've no basis for this at all.