If I was part of Durham's team I would scour every word of Comey's, Clapper's, Brennan's et. al. testimony under oath. It is noteworthy that while testifying before Congress under oath they all said no evidence of collusion but when on TV they said there was ample evidence.
This tells us they absolute understood the legal significance of lying under oath.
I would go out of my way to find and indict them on the least little thing they may have lied about during that testimony.
Not to be petty or vengeful or vindictive. Rather, to impress on all those who testify under oath in the future that they must be truthful, even if they aren't on TV or twitter.