This thread is completely unrelated to the behavior you are predicting. If the Return to Line option involved pushing past other guests to meet up with the rest of your party, sure that would lead to comments or confrontations. The scenario with Return to Line seems to be that the group waiting g for the rest of their party will wait at the merge point until the rest of the group gets there, so the other guests in line passing that person would be seeing their wait time drop or remain unaffected by passing the people waiting. What could possibly spur anger in that situation??? "No fair! Why does that guy get to stand around watching as we happily move up towards the ride?!?!" is not a reaction you will ever see. In my nearly 10 years of visiting WDW multiple times per year, there have been plenty of times when I have been in a group where 1 or 2 people fall behind as we enter an attraction queue. Whenever that happens, the rest of us pull off to the side as soon as we notice and let others pass us while we wait for our stragglers to catch up. The only thing anyone has ever said to us in those situations is, "Thank you." But you are insisting that a similar situation will result in heckling or worse in full view of CMs.