1) Biden did actively work to get the top Ukranian Prosecutor (Shokin) fired.
2) Shokin was investigating a company where Hunter Biden was a board member.
3) Shokin was incredibly corrupt.
With that said, Biden probably wasn't the right point person because of 2.
4) Hunter Biden likely only received that board position because of who his dad was given his background.
5) Biden was not fully honest about extent of his discussions w Hunter re Burisma.