Excellent once again, anon.
Here it comes!
>truepundit.com/inspector-general-probes-mccabes-insurance-policy-details-fbi-concealed-evidence-run-clock-hillary-investigation/
Indeed. According to that article McCabe and Strzock slow-walked evidence and just sat on it. When Comey finally did hear he tried to cover his ass and immediately inform Congress lest be be swept up in the obvious coverup. THAT's why he re-opened the investigation. BUT notice that in his letter he also leaves room for himself to continue to slow-walk it (red box in picture.)