I seem to recall a whole narrative coming up around Manafort's(?) indictment on charges having nothing to do with the Russian Collusion question, as being part of a deal whereby Manafort was giving up the goods on the Russian Collusion in exchange for the lesser charges. We needed to wait until the report was published, to see the full extent of Mueller's strategy.
Now the report has been published. It turns out those indictments for unrelated crimes and process crimes were actually the high water mark for Mueller's investigation.