This is a mere guess, since we haven't seen any evidence of it yet, but I bet one of the reasons this is taking as long as it has, is Obama issued pardons to all his co-conspirators on the way out the door. New crimes have certainly been committed since then.
I sure wish POTUS would unseal Obama's school records……kind of like a Christmas Eve gift. But of course, this would be done strictly in the interest of disclosure and transparency. Nothing about giving Obama coal in his stocking.