is one piece episode 104 filler?

In Yuba, Luffy learns that Toto was entrusted by Cobra to watch over the land and figures out a way to stop the sandstorm. At Rain Dinners, the officer agents learn that their leader, Mr. 0, is actually Crocodile and learn that they are going to overthrow the country during the war.

Mr. 3 appears and reveals that the Straw Hats are alive. As a punishment for his failure to kill them Crocodile dries him up and drops him into a Bananawani pit.

Crocodile has Ms. All-Sunday tell the rebel army to kill everyone on sight.

Meanwhile, the Straw Hats depart to Katorea, but Luffy stops.