The thing that bothers me, and I can't get past, is that Hur said that he would have prosecuted Biden but for the fact that he would have trouble getting a conviction because Biden the project an avuncular aura and along with his cognitive issues, would thus prove to be a sympathetic witness. In short, Hur's commentary about Biden's cognitive issues with certainly not gratuitous, but rather central to his decision not to prosecute Biden.
It's pretty obvious: Hur knew there was no case against Biden and he couldn't be charged, but he's a hack who didn't want to admit that outright, so instead he construed this absurd excuse as to why Biden shouldn't be charged.
Let's not kid ourselves; this was his audition to be Trump's Attorney-General.