Regarding Wells promotion. Marzi is 0-7 with a 7 era and is still there. Yes he had a great strikeout game with 11k in 5 but that doesn’t win games. I think it’s time to swap spots with someone with a 5+ era and get Wells a shot to see if he can continue his dominance in every level he’s been in. He is at the top or near the top of every league he’s been in for ERA and Whip and average against. I saw the ETA is 2020 but if he continues I don’t see why we couldn’t get a peek in 2019 in the bigs.
I'm not sure I'd go so far to say Wells has been "dominant" at high A. 2.58 ERA is nice, but it's a pitcher's league -- minimum 40 IP (eliminating most relievers), Wells' ERA ranks 17th, and it's only a 12 team league. His K rate is right around league average. And he's not young for the league (almost 24), and at 6 foot 8 inches, with that downward plane -- you'd like to see him striking out more batters. A low BABIP is nice, but I'm not sure how projectable that is. Poppen, Stashak, and Vasquez have all been promoted already, with higher K rates. (Marzi strikes me as an org filler type, so I wouldn't be too concerned that he got promoted "ahead" of Wells.)
I might promote Wells too, but he will have plenty of opportunity to rise quickly if he truly starts dominating and missing bats. He's not Rule 5 eligible until after the 2019 season.