Ok, so in your recent analysis post, you talked about Roman getting anxious. I have a headcanon that all the sides feel a bit of what Thomas is feeling. If Patton is taking over, making Thomas happy, than the others become slightly happy, not just because Patton is awesome, but because they are part of Thomas. In that video, it's kinda obvious that Thomas in anxious due to all the change. The others also feel anxious because Anxiety is currently the loudest side. Just a thought.
this is really well thought out and i like this idea. this would make sense considering they are extensions of his emotions/personality! when logan controlled most of the thought process in the Growing Up video, thomas was more future-orientated, but morality was also feeling quite strong then in a negative way, which clearly affect both thomas and himself.
i really like your headcanon ahh