All whacking targets allways get revealed, wether it is the BG himself or someone who was protected is another matter, for us players to figure out, BG's role never gets officially confirmed (only when he is succesfully whacked or lynched). We can discuss that after the game more. But right now, BG was obviously the one who was targeted for whack, and he/she needs to say so openly in this thread.
The D can investigate while in jail, so dont see why the BG couldnt protect either, its related to the straight forward narrative, thats how this game was started to begin with (basic premise, even if we in this forum make jokish versions, the basic should be ze same), story/narrative. And in this context it would be as the detective comes out of jail and checks his case files and finds the proper target of his investigation is conclusive now. Same with BG, comes out of jail at deadline, and hurries to protect targeted victim etc. Thats how I recall it from previous games.