This footnote may give us a big clue.
On p300, we meet Agent#4 as he sits on a train bound for Budapest. He is reading a newspaper. We discover that Agent#4 was involved in the assassination of Archduke Ferdinand, presumably to stimulate World War I and generate business for Vevoda.
Fn2 mentions that the assassin was described in another book by V.M. Straka, The Black Nineteen, on p262.
We don’t have a copy of The Black Nineteen. But if we consider that FXC wants us to look at p262 of Ship of Theseus, we are not disappointed. There we also see Agent#4. S. is staring at a picture of Agent #4, sitting on a train and reading a newspaper (see p261). On p262 we see, on the back of the picture, “#4” and the names of six locations paired with dates.
Danzig – Berlin, Oct 1908
Tangier, Jun 1905
B——, Oct 1906
Los Angeles, Dec 1910
Tripoli, Sep 1911
Salonika, Mar 1912
We infer from this that Agent#4 was directly responsible for tragedies that occurred in these places during those years in addition to his 1914 involvement in Sarajevo.
The third date on the photograph is B—— in 1906. We know from p261 that Agent#4 is the detective of Vevoda who provided the bomb that would kill scores of people on the wharf in B—— (p100-101). As Agent#4 handed the bomb to his partner and provocateur, he did so in an alley next to a large building with two important things written on it. The first is the name of the building: CENTRAL POWER. The second is the symbol S.
In 1906, Agent#4 provides the bomb in B—— to provoke and end to the strike while next to a building labeled CENTRAL POWER.
In 1914, Agent#4 provides the team of assassins in Sarajevo to provoke national outrage and war. And he succeeds, as a group of countries called the CENTRAL POWERS declare war.
What are we to infer from this obvious parallel focus on CENTRAL POWERs and the more-than-coincidental appearance of Agent#4 on p262 of Ship of Theseus?