They may be hoping he'll get "the rest of the way fixed" shortly enough so that a second DL stint won't be necessary. With CPAP there are literally thousands of different masks/headgears from which to choose. It can take time to find the right setup and get comfortable with it (if Apnea is even his problem). As a former boss, my greatest pet peeve was a guy showing up late. Guys that were habitually late were gone. Quickly. Braddock showing up late on a regular basis might be disruptive to day to day operations, yet still be forgivable due to it being a medical issue. Maybe this is Roenicke saying "Zach, we just can't have this disruption all the time. We gotta send you down until this is fully under control." My guess is just a guess like any other, but I've had Apnea for 20+ years now and have worked closely with professionals in the industry on new equipment and therapies. I can easily see the above scenario, or others along the same lines, happening. Sleep disorders can be tricky.