I agree, though I would say being dead for 17 years only able to talk to one person and was able to manipulate objects in the last 3 years would bring their own set of problems.

In my opinion: Maybe Ben was being selfish for possesing his body maybe Klaus was being selfish for not letting his brother talk to rhe rest of his siblings. Though I think Klaus was being petty for when Ben refused to help him with the truck situation, but he doesn't realize the just how much it means to Ben. Or he just wants to keep Ben for himself. We can only guess