According to a Cubs employee, Patterson has 4.007 years of MLS which means that the Cubs can still option him to the minors without his consent once. Had he been past 5 MLS then the Cubs would have needed to get his consent to be sent down. Another part of it is since Corey has passed the 3 years MLS sending him down required that he clear major league (revocable) waivers. The most likely scenario is that Patterson along with several other players were placed on waivers days before this. Teams often place their players on waivers in groups so as to disguise from the other teams which player will be moved. After Corey cleared waivers, then Hendry was free to either trade him or option him to the minors. Of course, the next time the Cubs bring Corey up, they will no longer be able to send him down again without his consent.