username: “Where does Tosfos say that? I don’t see it there.”
Sorry. Typo. Shabbos 55b d”h Maavirom.
I disagree about your take on the Yerushalmi. Being a shofet means judging, and the possuk, according to the Yerushalmi, says that he was a shofet for 40 years, which the Yerushalmi interprets as meaning only that the Plishtim were scared of him for 20 after his death. This is corroborated by the Korban Ho’edah who explains that it was just that they thought he was alive. So he wasn’t really a shofet then even according to the Yerushalmi.