Yes, this is an important arc that links to the final Wano arc. Besides, in this arc, we can confirm that Sabo is alive, which probably reassures Luffy that he still got another brother and another reason to live. Then, at the end of the Dressrosa arc, the Grand Fleet is formed, ...
Obviously and understandably, the player was a bit troubled by this turn of events. So, on his turn, he asked the GM what his character could do to “put himself out.” The GM said there really wasn’t anything he could do. The GM wasn’t technically wrong. I mean, he was wrong....