Roger and Shanks literally don't cut and is that happens in the manga.
WB bisent was also a blade, but he didn't use slashes, he used his weapon to channel his earthquakes
Fujitora also doesn't use his sword to slash, but to channel his gravity power
Roger and Shanks are using their weapons to channel and shoot with their CoC powers, as we can clearly see in the panels that Roger and Shanks attack
WB bisent was also a blade, but he didn't use slashes, he used his weapon to channel his earthquakes
Fujitora also doesn't use his sword to slash, but to channel his gravity power
Roger and Shanks are using their weapons to channel and shoot with their CoC powers, as we can clearly see in the panels that Roger and Shanks attack