He's doing what Scott Brown should be doing and certainly not what I expected Robson to be doing. The last time Brown was superb for the 90 minutes was probably the last game against Hibs. Most games he hasn't been doing enough for the entire match. Robson gives his all and has been excellent off the ball, leading by example, but hasn't really been great on the ball. So Brown should learn how effective it can be and give his absolute all for 90 minutes.
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