Volume 3 arrived quickly and 14 is on its way. In my excitement I have ordered volumes 9,10, 11 and 13 as well as a book about power transitions 1964-1984 in general which has some minutiae I can use.
There are several other Oral Histories: the Italian front, peacekeeping and military engineering. They're collections of interviews. The questions are not only about what happened but about the country's situation in the 60s, the necessity of overthrowing Goulart, the position of the media and the Church, the following regime having lasted too much, enough or not enough and so on. Scholars have several papers on those.
Volume 3 has several first-hand accounts from men on the expeditions, including from the commander of the very first company Mourão Filho dispatched to the border as well as one of his subordinates. They have very important details but there are still gaps and apparent contradictions in the sources which can only be resolved with additional information and a lot of thinking.

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That's exactly what the legalist officers wanted to avoid. More specifically, they did not want any bloodshed between brothers in arms. The unity of the Armed Forces was more important than loyalty to the civilian government. Many of them agreed with the rebel cause and only a handful were willing to die for the existing regime. The rebels embraced defections with open arms and counted on them to win. With their side's civilian forces working since the very beginning they got a swift victory and the left's civilian forces were too slow to mobilize and got crushed.