I think the reason I'm not high on Anderson is that when I look at a prospect (especially a pitching prospect), I like to see something that's really exceptional that they can hang their hat on. Something they can ride to the majors on. Fried, Allard, and Touki have curveballs that are really, really special and that they can pair with good fastballs. Newcomb has effortless velocity from the left side that he can keep late into the game. Soroka has control beyond his years. Gohara can flirt with triple digits.
With Anderson, you see the word "good" a lot. He has a good fastball that has good movement but he lacks elite velocity and struggles to maintain velocity late into games. His curve and changeup both project as above average but neither one is a trademark pitch. He's also supposed to have good control. But he doesn't have anything that's really great. If he can develop his curve or changeup into a devastating pitch or if he can add enough velocity to his fastball so that it sits 94-97 throughout the game then he can really take it to the next level.
Right now, he reminds me of Matt Wisler. A collection of good pitches to pair with good control which is enough to rack up some nice numbers at lower levels but which doesn't play in the majors without something to hang your hat on. In fact, I think Wisler's a pretty good comp.