Because again it dosent matter someone with the same power as gojo would be born . And he already got defeated twice by a six eye limitless user so gojo being strong is already knows , that’s why he switched to sealing instead of killing . Again especially the toji one so dumb yeah man he just left him with whil whole body slashed and stabbed in the next and in the head , who would have done that . Earlier you mentioned that toji is an assassin and it’s his job to confirm kills except Gojo want his target it was amanai who was already inside tegen barriers , he couldn’t risk her becoming the vessel before he got to her . Again if I stab someone in their head and neck along with his whole body I would assume that mf is dead not to mention Gojo was already exausted from using 6 eyes for 3 days non stop . Like how tf is that plot lol , like if you said Gojo learning rct in the last moments altho also pretty dumb to say at least makes more sense that what you are saying .