Speaking of Toji, I think that a lot of people overrate his W against Gojo. It's not like he fought him in a fair 1 on 1. Bro had to nerf him by forcing Gojo to fight curses and sorcerers non stop for several days before their fight and he also had a specific ability that allowed him to bypass Infinity. The Gojo that lost against Toji was one without Blue, Red, Purple, RCT and DE. The moment that Gojo awakened Toji legit shat his pants.
You can target him if the "sure effect" also targets objects. As I said, if Jogo's heat melted objects then you could make a point for Toji becoming ashes. Also, not sure why you are adding the open barrier and gojo changing not his sure effect but rather the properties of the domain in the equation when both things are pretty irrelevant to this conversation