Well, you call the other persons in your group "my parts", yet you have also observed that they operate independently, often keeping you in the dark. That's why I wondered if they were really parts of you, or separate individuals who just shared your body. 'Course, even in groups that start out as one person who split, the others can become very separate entities, according to some of our friends. So I could be full of prunes ;) (But then I wouldn't call'em parts anymore, just people)

In terms of gaining psychological insight, yes, it's helpful to be able to communicate with the others, but their experiences and motivations may not be at all the same as yours -- which might mean their input on issues like misperceptions of reality might be helpful, but not in the way you'd think!

"I guess it would be nice to have more to go on than just the inferences I must make from their behaviors and some of the enigmatic messages they send me."

What do they say when you ask'em? Chances are that since you're running that smoothly in the earth world, there is something or someone keeping track of probably most (not necessarily all) things that go on, you included. (In our system it isn't a person.)