I would say that it is because the Durham investigation is simply ONE part in a massive network of operations that need to be orchestrated together to get the exact precise outcome needed.

a thousand different aspects, involving maybe hundreds of concurrent operations and situations.

just like the Arizona Audit has to be done with an absolute standard in order to be effective (setting the model for other forensic audits) so that the outcome is unassailable, the take down of the Cabal is something that involves hundreds of complex situations that must all be done in the right order and in the right way, to move the whole thing forward. It must be done absolutely correctly.