They can say he's gone for good as much as they want, we all know after the story mode credits he's gonna come crawling outta that volcano. If Kazuya could come back from being yeeted into a volcano (albeit with G-Corp's help) then an absolute unit like Heihachi could do it on his own
He literally rips apart a bunch of the main cast while smiling
Manipulative not so much but we prob haven't seen the last of the trio since they work for one of the strongest fixers in the city and verg only dismembered 2 of them