he hasn't even done stuff. He's been a good sport so far. Give him a chance.
the problem with this idea is that humans are both pattern recognizing and pattern acting machines. We see things that we've seen in the past and anticipate what they'll do next. Right now all the memories we have of bedpost are unpleasant, so naturally we all feel this unpleasant memory upon his return
At the same time people are creatures of habit and will have the same hardcoded personality from childhood to death. So the chances of bedpost being any different than he was before is too slim.