As mentioned before, I strongly urge those "undecided" or "neutral" to start SOMEWHERE, as technically you won't be able to leave Traverse Town without some form of transportation. You don't have to stick to the group once we leave Traverse Town as you'll have your mode of transportation (Dark Corridor, Gummi Ship, or Warping with Sara) and everyone might end up getting split up to different starting worlds anyway. We just need to get past the whole explaining of what's going on and the situation at hand, since it's not possible for the characters to know without SOMEONE explaining it to them.

tl;dr Pick a place to start pls thnx