From what I can make of the two umpires decision (It wasn't just Hair), the dramatic chnage of the ball occurred between 18 balls that were delivered.
It would seem that only one four was scored in those 18 balls and nothing else occured that would make the ball chnage so dranatically, apart from tampering.
I guees it wouldn't be difficult for Sky to have a look at those 18 balls and see if anything unusual occurred that would flaw the umpires (notice I say umpires and not umpire) judgement.
I think there is no doubt the condition of the ball changed dranmatically in those 18 balls to make the umpires come to their decision.

I suppose that the two umpires have been instructed not to comment until all investigations are over.

>>Inzamam could be banned for up to four Tests or eight one-dayers when he appears at an ICC hearing on Friday.<<

Now why would ICC do that unless they are absolutley sure that ball tampering occurred? I suppose we will get to know more on Friday. It would certainly IMHO be aesier for ICC to back the Pakistani's than back the umpires if the evidence is in any way flawed.