In my Week 4 MiLB report, I included a brief writeup on Blue Jays pitching prospect, Roberto Osuna, highlighting his hot start to 2013 season at Low-A Lansing. My blurb from that particular post: “Number five on my Blue Jays top ten from March, Osuna is a rather plump 18-year-old with a front-end arsenal. Through 18 IP at Low-A Lansing, he’s posted a 26/3 K/BB along with an ERA at 2.95 and a WHIP at 0.82. Some folks are concerned about his potentially tubby frame, but the stuff might just be good enough to overcome the weight issue.” Well Osuna was pulled from his most recent start with elbow discomfort. A subsequent visit to Dr. Andrews has revealed a UCL tear, and it’s now all but official that the Jays’ prized prospect will require season-ending Tommy John surgery. The developmental setback is disappointing, but at age 18, Osuna was ahead of the developmental curve already. There’s still reason to remain optimistic about his future outlook, but it looks like it’ll be a full year before we see him pitching in a meaningful game again. And that sucks.