How much possibility do you think there is for Hisoka not being present on the boat?

Personally I don't think the possibility is too high, but it is there for sure. Hisoka could have some interesting sub-plot with the characters that (are probably going to) stay out of this arc, like Gon, Killua or Illumi.

There are a number of examples where Togashi introduces a plot thread, but expands on it only after an arc or two passes. How much possibility do you see for Hisoka staying out of this arc, and coming back to continue his hunt after the DC arc is over?