They erase a few seconds. Starlord won't forget he's in a fight in that time. I don't get how Starlord would just 'stand there' like you're saying and be unable to react to Yatsu's attacks completely, without naturally creating his own reactions even if he's standing there confused. Theres a giant guy with a sword he's facing. He would not completely forget he's in a fight at all.
Erasing memories makes people forget, ad would only incovenience reactions. They don't take away someones ability to completely react to anything. Starlord wont be standing there for 3 seconds unable to react at all, he would just forget what had happened temporarily, but he'd be doing that when he's out of Yatsu's range completely.
Doing it subtly wont require close combat. All he has to do is make sure Yatsu doesn't notice, which would be easy for a professional Ravager and conman, who could even trick Iron Man and his sensory equipment. He can pre-plant the mines too and lure Yatsu in with Traps like they're designed for. If Yatsu tried to destroy them either, he's going to be open to more attacks that Quill can pull. Quill doesn't need to specifically aim at him either.
Its not like they woldn't stagger him completely. All Quill needs is Yatsu's guard down quick and then its easy to assault him sing electricity. Its not like Quill wouldn't have more than one either, saying Yatsu is going to be able to take every little thing down isn't exactly fair. In fact, if he has a tendency to do this, all Quill has to do is throw an explosive that would stun the guy lmao
Yeah, we all know how you keep saying 'he can dodge them', but that still doesn't disregard the range and versatility advantage does it? We see that Yatsuhashi prefers to block than to dodge from his actual fight, and he's a gigantic target. He's not an agile fighter, his role is used as that of a tank. I can make the same argument and say Quill can 'dodge' Yatsu's attacks as well, sice he will be far in the air than the grounded Yatsu, with no stated range that Quill couldn't close between them for this semblance. He wont just 'forget' about Yatsuhashi, just forget what happened in those 3 seconds temporarily.
Either way this was a bracket match anyway, seems its over and i was too late rip, so no point in continuing