I think McCullum has been scoring decisive fast runs. Guptill, Taylor and Williamson are our anchors and McCullum, Anderson and Ronchi are there to score at over 100 strike rate, so they take more risks with their shots. I know this is a much easier call after tonight! but all the same we've been winning and I think having McCullum there the opposition is intimidated knowing that if they get through the 3 above he can still take the game away from a team in a 5 over spell of power.
Certainly is more of a question for the tests. I think his test match contribution has been on the low side. If he comes right in tests we could start destroying some teams.