It's not rocket science
Guillermo is the main hitting coach and Mattingly is the offensive coordinator or whatever and the big persona on the bench. Mattingly is on record saying that "damage is a scary word."
Mense and Hague are minor employees. They probably don't even have the authority or control to bear any of this responsibility. They may be good or bad, it doesn't even matter.
Martinez and Mattingly NEED to f***ing go.
If the org keeps the other two, whatever. They might be decent lower level hitting coaches who would help underneath a proper system.
The MUST BE FIRED list for me would include: Atkins, Schneider, Mattingly, Guillermo
Joe Sclafani: Director, Player Development
Shane Farrell: Director, Amateur Scouting
And maybe Lacava and Tinnish. And of course any other bad seeds in the scouting, player development, baseball operations, advanced analytics, advanced scouting / game prep departments.