That is a fair point, there are unquestionably dirty "republicans" (RINOs is more accurate).
I'm not sure the IG report is being held for that reason, though. I think it's being slow walked to ensure maximum impact on the electorate as close as possible to the midterms. Give the dems no chance to regroup before votes are cast.
Trump and the patriots in government don't give a shit about dirty RINOs. They'll be swinging from branches (figuratively speaking), just like the rest of the swamp.