we may have different definitions of shot creation.
both CJ and Middleton have about the same assist rate; and both of them create about 58% of their own shots themselves. Middleton is better at it though because his TS% is .603 this year, while CJ's is .577. That's not a 1-year thing either because Middleton has a significantly higher career TS% than CJ
Holiday is also at the same level this season as Middleton and CJ in assist rate, although his career rate is over 30%. This season, he's creating 56% of his own shots, almost the same as the 58% of Midds and CJ. But his TS% is 20 percentage points better than CJ
so in terms of shot creation, the ranking sure appears to be 1) Giannis; 2) Dame, 3) Middleton, 4) Holiday, 5) CJ
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as far as Melo, his TS% is .530, while Portland's team mark is .574. His points/shot mark is 1.18 while the team's is 1.27. So, Melo is creating shots at a much less efficient rate than the team he plays for. I guess you can expect that a player's efficiency would drop a little when they were in iso, but I don't think Melo's shot creation is much of a plus, especially considering how motionless the Blazer offense becomes when Melo is doing his 'back-down-dribble-festival'