Basing it on the evidence gathered and presented during the public hearings conducted by the Senate on the Atio hazing case, the DOJ panel may have overlooked or disregarded the cover-up angle committed by the other frat members not included in the indictment.
The pieces of evidence like the authenticated contents of the group chat participated in by clearly identified members and officers, the video footages and other documents should have been enough for the DOJ to find probable cause to also charge them for being accessories after the fact at the very least.
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Related:
At a Glance: Findings and recommendations on the fatal hazing of Horacio Castillo III
At a Glance: Social media chat among Aegis Juris members, regarding the death of ‘Atio’ Castillo
Footage of Aegis Juris members meeting at Novotel
The Anti-Hazing Act of 2018 passes the bicameral conference committee
the evidence and videos are sufficient enough for them to prosecute BUT the amigo/compadre system still works in the dept Justice was sold and now dead.