My bet is The Prince of Darkness got Comey by the short hairs.
I also think Comey had to do something to head off WikiLeaks direct connections to 0bama.
He can’t head off the e mail connection to Obama.
At the very best, the Comey gambit is to hide the effect in the noise about the hillary candidacy ending
Obama is likely toast in the long run but by that time the electors can vote and Trump can get a judge to swear him in before Christmas