*MLB Prospect Watch will be recapping each farm system as a whole, focusing on particular players who did something noteworthy this season. During the off-season, we will be featuring one organization per day.
The Diamondbacks don't have a deep farm system, but they do have a potential staff ace in Archie Bradley, which puts them ahead of a number of organizations. Bradley has his issues to overcome, mainly both command and control, but his potential is still atop of a big league rotation and he's nearing the majors.
Biggest Step Forward: Brandon Drury, 3B: There are still concerns about Drury's overall profile, but the longer he continues to put up 40 double/20 homer seasons, those concerns will simmer. He was aided by the California League, but it's his second straight year of impressive production, so we can't negate everything based on his hitting environment. His approach and strikeouts may keep him as more of a second division regular, but he continues to make improvements, so he may overcome them as well.
Take a Step Back: Stryker Trahan, OF: It would have been acceptable to mention Archie Bradley in this category, who was thought to be on the verge of a major league call-up this season before battling injuries and continued command issues. But Trahan took an even bigger step back by moving from catcher, where he was unlikely to ever progress far enough to handle the defensive rigors on a daily basis, to left field, where his entire value will be tied to his bat. Then he batted .198 in a half-season in South Bend and was demoted to short-season ball before year's end.
Ready for the Majors: Jake Lamb, 3B: A similar description as the one for Drury could be used for Lamb, though with more extremes. Lamb has long been dismissed by scouts as someone with holes in his swing that will keep him from being anything more than a second-division regular, yet he's done nothing but hit at every minor league level. With an opening at third base, Lamb got a brief taste of the majors at the end of last season and the hot corner job should be his to lose this spring.
Statistical King: Peter O'Brien, C/1B: Acquired during the season from the Yankees, O'Brien finished the year with 34 home runs and a .594 slugging percentage. That's the good news. The bad news is that he has virtually no defensive position (though the Diamondbacks appear to want to give him a chance to stay at catcher) and a terrible approach at the plate that leads to high strikeout and low walk totals. Power is scarce, so O'Brien will continue to get chances, but he'll have to hit 30-plus home runs in order to have value.
Newest Addition: Touki Toussaint, RHP: Taken 16th overall in this year's draft, Toussaint features the potential for a plus fastball and a plus curve ball, but is very raw and will have a long developmental path in front of him. He should get to full-season ball next year at some point, but it wouldn't be shocking to see him stick around in extended spring training or spend some time in short-season or rookie ball first.