Ok no. I didn’t particularly care because the anime isn’t canon but guys that letter wasn’t for Sakura’s birthday. That is WAY overreaching. It is far, far more likely that he gave his letter to Sakura for her to offer THEIR congratulations to Naruto. You know, like couples do.
No one sends “congrats” for someone’s birthday. Plus there wasn’t anyone else who wished her a happy birthday either. It makes no sense. The congrats was meant for Naruto, but Sasuke wanted it to come from the both of them, hence why he sent her to relay the message instead of sending it straight to Naruto.
Idek why I even bothered to write this when it’s just SP filler anyway. It just bothered me to see so many of you overreaching.