A good deal of the awkward negotiation-type things around the ship get delegated to Mohinder. He's better-spoken than most of the crewmen, and at the same time, his 'social embarrassment' gene never quite developed fully.
Therefore, when it was brought to Captain Kaufman's attention that Harlan and Hardaway had somehow managed to kidnap the wrong Mr. Gray, the task of informing Gray that he was a free man and issuing the proper apologies had been assigned to Mohinder, as nobody else in their right mind wanted it.
"Aiya," he calls, coming up behind Gray as he works, "a word with you, if you please?"