Craig Brooks was already 22 when he was drafted in the 7th round back in 2015 so you might expect him to move quickly. That trajectory is often reserved for college picks in the higher rounds, however. Despite starting off in rookie league and Eugene in his draft year, Brooks has been promoted mid-season every year since, struggling each time at the higher level. However, when he'd start at the same level next season, he has always shown development and improvement. If we remove the stats from his mid-season promotions, these are his numbers once he adjusted to the league. In Eugene and South Bend, he needed no adjustment period dominating the league right away those his walks spiked in his time in South Bend. 2015 Eugene - 10 G, 10.2 IP, 3.38 ERA, 3 BB, 21 K, .179 BAA, 0.94 WHIP 2016 South Bend - 23 G, 32.1 IP, 1.39 ERA, 20 BB, 42 K, .196 BAA, 1.30 WHIP 2017 Myrtle Beach - 12 G, 20.1 IP, 0.44 ERA, 6 BB, 30 K, .134 BAA, 0.74 WHIP 2018 Tennessee - 16 G, 21 IP, 2.57 ERA, 7 BB, 25 K, .157 BAA, 0.86 WHIP His mid-90s FB and sharp-breaking (sometimes deadly) slider have gotten him this far. He has yet to fail at learning, improving and adjusting to his league. He has 2 more levels to adjust to before he can be a good major league reliever, so I'm still wait-and-see at every level with him. But the track record of development is there and the stuff in his 2 pitch mix is major league quality already for a MIR. If the pattern holds, he'll be promoted to AAA mid-season and struggle. Then start 2019 performing well and readying himself for his first taste of the bigs. With Randy Rosario and Justin Hancock looking like keepers as relief depth options, Dillon Maples working out the kinks but maintaining his high ceiling and fellow AA relievers Dakota Mekkes and James Norwood having solid seasons, the Cubs have some solid bullpen depth. That's 6 names to go along with Morrow, Edwards, Cishek, Duensing, Montgomery, Smyly and Strop (assuming the Cubs pick up his option, and why wouldn't they) all under team control in 2019. Norwood hasn't quite proven himself to the level of the other minor leaguers, but his current numbers warrant his inclusion for now. Cory Mazzoni is deserving of a mention as well. When you add current starters like Alzolay, De La Cruz and (heaven forbid) Duane Underwood as relief options, that's 17 names. I don't think I've seen such quality depth of pen options before.