I think Aftab's uncertainty brought back Alok in the team. Rana is / was always in consideration in ODI even Aftab is / was fit, so he will remain in the team, be it super sub or not. For the replacement of Aftab ( if not fit or off form ), Mahmood and Alok come first as new name in the team, but as we all know Mahmood is not for all ODI, Alok can bowl and field better than Mahmood, so Alok get a chance in the team. In that sense, I think selectors made a sensible selection, if the scenarios are like above.
If it was Rokon, then I am sure this thread would have gone up to 10 pages already, selectors might have tried to avoid that situation.
