The problem is, any of the guys who have a legit ace upside in the Cubs' system is either a long way away (Pawelek) or has had to deal with injury issues (Guzman). Essentially, that leaves the Cubs with a ton of guys who have ceilings of 2/3/4 starters, although there are some intriguing candidates to break out in the future. However, for now, the depth in the Cubs' system has much improved because of these guys. From this group, Marshall has been the most impressive in the times he's been healthy. His finger issue is bothersome (and I really do wonder what he was put on the DL for recently), but he has not suffered any ill effects from it with regards to his performance. He also did a really good job flying through the Cubs' system last season when he started out in Low A and posted an obscene 51:4 K:BB in 49 IP. He double jumped to AA last season and had some struggles, then was shut down with his finger problem before he could adjust. He's returned to form this season and seems to have gotten himself back on track. A lefty who throws a sinker in the 88-92 range and can dial it up to the mid-90s is always helpful, but combine that with a plus curve, a developing slider, and a change that should end up being an above average pitch when all is said and done. He still has to fill out his frame at 6'5 180 pounds, so he could well become even stronger given time. He might be a quality #2 in the average ML rotation when all is said and done. That kind of prospect is always welcome is any system, imo.