All of Gohmert's remarks were informed by material on the public record, so think of his conclusion as an opinion. Horoqitz coul dhave hard charged his Comey report by saying at the start that Strzok and Page determined no clasified material ws leaked - instead he said at the start that "The FBI found," and buring 40+ pages later disclosed that "the FBI" doing the classification review was in fact Strzok and Page.
Horowitz did disclose it, but in a soft-pedaled way.
Gohmert is of course playing a role. He is a politician and as far as I know, wants to be re-elected and maybe bury a few Democrats on the way.
I think Rosenstein is bad, but I have doubts about the recent take, fueled by JW disclosure.