I don’t think for one moment Trey Gowdy has been bought off. He works for Boehner who is Speaker of the House. So he can only go as far as Boehner will let him. Same goes for Issa.
I also think the whole Benghazi thing was that Hillary had a gun running operation out of that CIA annex behind the US mission in Libya and when the SHTF they didn’t want it discovered so they just stood back and hoped it would all get covered up in the destruction. Ambassador Stephens and all the rest were expendable. Likely nobody will ever really get punished for it.
The GOP does not have the stomach for witch hunts like the Dems do. Its just not in them or they would already be either impeaching Obama or making Herculean efforts to stop his amnesty and many other overreaches.
US Representatives do not “work for” the Speaker of the House.