That's one of the reasons to not include the speculation that they were some sort of Svengali pulling all the strings.
The Islamic Caliphate, which Osama Bin Laden wants to re-establish, did the killings.
Shifting blame from Osama to the Germans ain't in the cards eh!
There was no attempt by the book's author to "shift the blame." The author did however find facts that prove that there was involvement in the crimes. That was true of some German officers. Others were passive and some tried to report the crimes but were reprimanded by their superiors.
One book reviewer wrote "A commission on these atrocities, which issued its final report on March 29, 1919, accused Turkey and its allies (the Germans) of using barbarous and illegitimate methods against the Armenian citizens. Again, a committee of jurists in 1920, commissioned by the Council of the League of Nations, concluded that the official order to deport the Armenians en masse "was a violation in international law" (p.l9). Two German generals, Bronsart (on July 25, 1915) and Boemich (on October 3, 1915), who served as members of the military mission in Turkey, are said to be responsible for ordering the Armenian deportation."
Here the reviewer is referring to one or two incidents of deportation not the whole operation which was of course the doings of the Ittihadist Turks (Young Turks). I believe that Ittihadist refers to the Committee of Union and Progress Party, not sure.