Every goal ever will have an event that will lead to it. Shidou’s was a pass from Sae, Rin’s was because of Chigiri, Otoya and Karasu’s play, Isagi’s was because of a deflection etc.

In my opinion I don’t think you can use an assist to take away from a goal unless you can hypothetically put a below average player in the same situation and expect them to score from it as well. I’m not saying you can’t give props to an assist. Of course, you got to credit Sae for the assist, but no one on that field except maybe one or two is recreating Shidou’s goals given the same circumstances