Ahhhahahaha... people only now are slowly waking up to the "inconsistency" catastrophe of post-timskip one piece. Let's say you convince yourself that the "flying six" used spiceficly "invisible" CoA which wasn't visible and had a minor effect to the fight overall, then how the fuck are you going to explain CoO??? Oh, try to do that if you can lol.
Franky, Robin, Nami none of them have haki, so thecniquely speaking Franky should have not been able to lend even one hit on Sasaki since Sasaki has CoO while Frank doesn't. Oda could have easily fixed that by giving them ether CoO or some type of thecnolagy that could counter "weak" CoO–but he didn't. This is one the reasons why power levels don't exist in post-timskip one piece, it's all imaginary in your head, none of it is real in the "story" and never will be, Oda is indeed the undisputed God of inconsistency.
Franky, Robin, Nami none of them have haki, so thecniquely speaking Franky should have not been able to lend even one hit on Sasaki since Sasaki has CoO while Frank doesn't. Oda could have easily fixed that by giving them ether CoO or some type of thecnolagy that could counter "weak" CoO–but he didn't. This is one the reasons why power levels don't exist in post-timskip one piece, it's all imaginary in your head, none of it is real in the "story" and never will be, Oda is indeed the undisputed God of inconsistency.