I think the story needed this episode. Since the confrontation with the red dragon the story has been at times tense, depressing, or melancholy. I think having an episode that gets the group chemistry back in sync is great. We got a chance to lighten the mood and laugh at everybody else's mental images of each other.
I did notice that the new character's hand was the one that grabbed Marcy's during the blizzard, however, since Marcy couldn't see anything, she probably thinks it was a shapeshifter. Actually, that raises the question of where the shapeshifter versions of the newcomer are. Perhaps there wasn't a strong enough mental image that they all shared of each other to be included?
Looking forward to the new companion! She must be fairly skilled to avoid being detected until now despite the party's abilities (and Chilchuck's ears). Also, it seems like we have lost the blood trail at this point after all the shapeshifter nonsense, so the only way is into the maze of the 6th floor at this point.