Trump did not control his key picks - McConnell did, because he controlled the Senate confirmation process. The whole Russia-gate story kicked-off when the craven Jeff Sessions recused himself over some ridiculous pretext, leaving Rosenstein, the Dems and the FBI bureaucracy in charge. Trump's Admin was crippled after that.
IMHO Trump also believed his own bluster and greatly over-estimated his abiliity to control the deep-state.
You are Right on both counts. Wray and Barr doomed the country to the dismal place we are in now with no visible way out. The cheating is baked in and now that have they stolen AZ I see no path out.
Trump believed Hannity.............................