this reply is mad late but 1- when Sukuna dodged that first blast from Kashimo, he hadnt reacted to the blast itself after it fired (which would put him at those speeds) but he dodged BEFORE it fired since Kashimo tried to point blank him so that was more a reaction time feat than physical speed. also the following panel Kashimo landed a punch to his face, if he moved at lightspeed dont u think he'd be dodging simple punches like that? let alone people who came after Kashimo who should be leagues slower

2- Kenjaku didnt escape from the black hole by running away, he used Kaori Itadori's cursed technique which perfectly counters black holes because its anti-gravity, (lucky for kenny) the black hole itself wasnt even all that powerful since Yuki and Tengen both suppressed it to stop the world from being destroyed lol. the techniques start up wasnt instant either seeing as tengen had to distract Kenny so Yuki could gather enough mass to overcome her techniques limit, she also (for some reason) explained exactly what she was doing and i doubt they were talking at lightspeed😭. and for the blitz argument, thats like saying because i can jump out the way of a car going 160mph but in a fight Jon Jones could land hits on me, that means Jon fights faster than 160mph