You're assuming it's possible that Sasuke was in a good enough mood, at any point during his recovery, to escape and go celebrate by watching some fireworks. But no, in canon he was awake only about a day or so with a lot on his mind and lashing out at everybody who tried to talk to him. Him taking the time to go watch fireworks (especially with Naruto around, he was having severe inferiority complex at the time, was he actually able to set it aside for a day for some fireworks?? How convenient.) Not canon. The issue isn't whether it falls in a place on the timeline where it would fit, but also whether it's plausible given what the characters are going through during that period. Sasuke was NOT in a condition to go out during any time during his stay in the hospital. He wanted to go up on the roof with Naruto and Sakura told him he still wasn't better. She was worried about him, she wouldn't try to sneak him out just for a little fun.Instead of image spamming, actually refute my argument.
Canon is where the content in mind is relevant to the story. All filler episodes are presented in the timeline, whether they are in the present or go back to the past. That filler episode last week was during the inauguration of the 5th Hokage. It was during that time period, except it was just a scene not presented in the main plot. But it is still CANON, because it is not presented in an alternate timeline or alternate plotline.
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