How he isn't getting in their side ahead of Luke Wood is a complete mystery to me. Only reason I can think of is his left arm bowling offers some variation.
I can understand Luke Wood getting in. He was particularly good against Superchargers. But Sam Cook hasn't really been on it (in the 100 or the Blast).
Their next game (which is very close to being a must-win for them now) is only two days away. So for them to release him to play tomorrow suggests that they have little inclination of playing him on Monday - which is baffling.