I'm also on the same line as you're usually are, almost word for word most of the time, but regarding that topic, I actually wanted to ask in my post what ACTUAL star/ difference maker is a non, or even average, shooter in this league... Since I'm not sure if we're talking about the same thing here and all the names you bring are role players, including Dejounte who's shown he's not a real difference maker or that second star, let alone Sochan.
And yes, you can improve shooting but a few percents can go a long way and looking at the league, I'm not seeng many (real) stars who can help you ring who are average at shooting... All gifted that he is, Irving was a non factor with his bad shooting outings in the finals, while BOS had shooters all over the floor (OK, Tatum wasn't that great)
Then regarding other facets of Castle game (notably playmaking), let's cool down a bit too here. He didn't come as a natural PG, and it's not because he somehow hold his own and was OK against summer league no names that he suddently became a natural playmaker. He can become a decent one but that'll never be an elite, natural PG. That's not his niche or future in the NBA... If spurs get a Nolan type player next year, Castle will play 2/3 as a spur.
I mean, Sidy's playmaking and passing was also praised last summer league to such a point you could hear Boris comparisons. And now Castle is "Russell Westbrook, but with skills". Wow, easy guys, it's summer league and it's fortunate the kid can play basketball, that's why he was drafted. But Let's Castle show he can even be a starter before going bananas.