I actually got the time wrong, he had a few days left. But that doesn't
change his sense of urgency nor
annoyance at Sasuke's abilities.
Also looking back, Koji actually got
two-shot. Sasuke took
a couple hits before going down, if it wasn't for Naruto and Boruto, he would've shared the same fate.
Regardless, Sasuke OBVIOUSLY did better in terms of survivability, than Koji. Koji's attacks literally did nothing and he wasn't able to avoid any of Isshiki's own. Although Sasuke wasn't able to tag Isshiki, he was able to avoid few of his attacks due to "that damn Rinnegan".
In no world did 'Koji do better than Sasuke against Isshiki".