Did he say anything about the cabal/oligarchy being responsible for it?
>>Did he say anything about the cabal/oligarchy being responsible for it?
No. His investigation of Lincoln’s murder was of a straightforward conspiracy. Great grandfather was a straightshooter who spent his life defending his fellow soldiers, and nothing that he saw during his investigation gave him pause for their guilt or that there were others behind the crime. GGF was 2nd Cavalry until a horse rolled over on him. Then he transferred to the Judge Advocate Corps as he had been a lawyer before enlisting at the very start of the war.
I will say, however, that he was straight Republican all the way, appointed by William McKinley and Teddy Roosevelt and hated by the Democrats.
He had a great anger at liars. In the Indianapolis Archives I found a one page newspaper printing of a speech he gave in a town square arguing against a candidate for political office. During one of his conspiracy investigations, he had interviewed the man who had admitted to his involvement, but he was too small a fish to go after. Then, when the war was over, the man claimed to be innocent of it, and great grandfather stood in a town square denouncing him for lying about his involvement. Some reporter took down the whole speech and printed it as a separate sheet.