Satish appears to me to be the weakest link. IMHO, he is the one they should be spooking.
Remember the video when the Kalpoes got out of jail?
One ducked the cameras quickly at the police station, while the other was seen on camera for much longer.
Then when they arrived home, one walked into the house unshielded, while the other was wrapped by his mother's arms as they walked into the house. I wish I could remember which was which in those videos. One seemed much more spooked than the other at that time. I would guess that might be the one who played dominoes and heard of the gardener's story.
One more thing, Deepak is the one that spoke with Greta after their release. As far as I know, Satish did not speak with Greta. Satish might have been too spooked to speak.