I would just say it's a stumble with the huge caveat of "unless he's injured" (dur). But his groundball rate is beyond elite, he usually doesnt give up hardly any homeruns, his velocity is fine (92ish), he has a great pitchers ballpark, and his pitching IQ is off the charts. If he's healthy he can be a top 20 pitcher.
Maybe, but he's never healthy. I would never draft Anderson unless it was for a couple dollars in an auction or one of my final few picks in a snake draft. He's pitched 175, 112, 83, and 35 innings over his career. You can only expect maybe half a season from him, and that might be optimistic. He was being way overdrafted this season.