Didn't watch much of Reddish in NY but my read on him in Atlanta was that he had a viable 3-and-D skillset but lacked the mentality to match. He wants to be The Guy rather than a roleplayer, but he just isn't that good. Doesn't do any dirty work. 6'8" but doesn't rebound.
If he committed to defense and ball movement and if the three ball improved some, he could be a solid piece somewhere. But I see him as a long-term project, not a guy we plug in who helps us now. Rather stick with Hauser, tbh. The shot is showing signs of coming back around (37.5% from 3 over the last 10). And on a broader level, he has demonstrated willingness to work on his game and he understands what he's good at on the basketball court, neither of which I'd confidently say about Reddish.
Pass.