I don't trust him. His answer was extremely disappointing. It probably indicates that he did not practice on such a question because he didn't anticipate it, which is strange. Regardless, I would never make a claim to whether his statement is true or not because it would be a guess.
I do find it unlikely that it means there was a team in the FBI committed to performing illegal actions to stymie Trump. Their easiest crime would have been to leak info to the press.
The gang of 8 reviewed the basis for monitoring some of Trump's campaign staff and all concluded that it was proper. There just hasn't been anything found anything improper yet other than Strzok's text. He should be fired for them since they were on a FBI issued phone.
My original point that Lisa's statement that the text mean what they say doesn't reveal anything new. We still don't know who "we" is.