It's about creating a trail that everyone can follow on the way to justice. The IG reports, congressional testimonies, and declassifications when taken as a whole show an irrefutable proof of work that has been published piece meal through the years through official channels that refute any arguments present and future that say the coming prosecutions are political.
They will say that the prosecutions are political, but this is abiut history. Historians won't be able to deny that it was a time consuming process that followed legal steps. Not something that happened in a rush before an election in order to win an election. Anons will be there too to agree, yep, it took a looong ass time, but it was vy the book.