Exactly lol
- Power Mochi was flatly matched by a G3 Elephant Gun.
- Mogura is lethal but has a windup time and is hard to land.
- Zangiri Mochi, his strongest attack, had equal portrayal to King Cobra, which is a far cry from G4 Boundman.
It's not like King would fail to hit Katakuri has well. Marco and King are portrayed similarly in speed and King just blitzed from the Live Floor to Onigashima's edge within seconds. They would definitely land hits on Katakuri more frequently than Luffy did and these attacks don't stop after a time limit. King has massive AOE Flames as well - burning down the Live Floor, burning down Oden's castle in the flashback, etc.
It's definitely a tough battle and I'd bet on King since his endurance is stronger. Jack was able to fight without exhaustion for over 5 days and King can probably fight for long, if not restricted by plot lol.