Shokin was NOT prosecuting corruption. He was accepting and extorting the corrupt for bribes.
There was nothing to cover up.
He was told he had to reassure Trump on the call that he was willing to work with Giuliani to investigate Burisma/the Bidens, and the 2016 conspiracy theory.
There are even text messages.
Litigating every subpoena thru the courts is a delay tactic.
Dems are not playing Trump's game.
In fact, the majority of your actions took place AFTER the Mueller investigation had wrapped up.
Your efforts were intended to influence the next election, by smearing Biden.