What really got me about this scene was the fact that Scott and Stiles were the only ones who got that extra special meaning to this part.
Scott wrote A.A. to represent Allison, his first love. And Stiles saw the D.H. that symbolized Derek, made him smile, revealed that he did indeed miss Derek.
Now, based off of canon, it would have only made sense for Scott to get this meaningful addition to his part in this scene since Allison was canonically his girlfriend and anchor so his actions were only natural. And if not just Scott alone, it should’ve been the entire pack or at least Scott, Lydia and Stiles who got something else in this part.
Yet, only Stiles and Scott were singled out. They were the only ones who felt something that ran deeper than writing their initials as a reminder that they were there in BHHS.
Scott, as stated before, put Allison’s initials which was a clear message that he never forgot about her, that she was still there with him, at least in his mind.
Stiles saw the D.H. and smiled at the thought of Derek, at the remembrance of him.
It really makes me wonder just how important Derek really is to Stiles. Like, does Derek mean as much to him or almost as much to him as Allison means to Scott?
This scene was able to broadcast a lot about the developed relationship between Stiles and Derek, but maybe there’s a possibility that there was a hint or deeper meaning that wasn’t noticed.