>>23491862
The Stomachs were originally to have been wiped out in the middle of the show and replaced by a different mafia family. Takebe later scrapped that idea because she liked the actors and wanted them around, and the new mafia family got reworked into Bocca and Lizel.

>>23467403
The Stomachs weren't even planned to make it past the middle point.

>>23454657
Because the staff literally said it.