1. Because law has 0 advanced observation feats. While the sbs confirmed that koby does. Your example of advanced observation for law isn't even advanced observation since again his crew who don't even have observation were hearing luffys subconscious.
2. There is no argument between you and I. That would implie that you presented a point.
Law has basic haki feats and that's it. Everything else is because of his fruit. Again at best if he losses his fruit he would be headliner level.
1. Post the sbs stating koby has future sight.
2. This is laughable, You're clearly arguing that Law is Headliner level and i'm stating he's shown far more than them, and Franky. Who you've yet to make a statement for, since that's the person you say he's weaker than.
3. I already posted him slicing a combination homie of one of big mom's most powerful shown attacks without his DF. That is still something. And we know he can take hits from an armament yonko, something that's done damage to people like Queen. Sorry if I don't buy you're "He's headliner level" just cause you say it over and over and over.