The result meant Odisha remain rooted to the bottom of the table with two points from eight games.
A fruitful loan tenure at Hereford United with 11 goals in 19 appearances earned him a permanent move to the League One side Scunthorpe United.
Gill was their first choice keeper and made over 30 appearances for the club over two seasons in the I-league before moving to Bengaluru FC.
Kerala, who were already hampered by injuries this season, suffered a major blow in the fourth minute when captain Rodriguez went down injured.
Chennaiyin custodian Karanjit Singh was called into action twice early in the game as Kerala imposed themselves.
The left-back was one of the first picks for Blasters in the player draft with the club tieing him down on an initial one-year contract worth Rs 25 lakhs.
Kerala's stuttering campaign in the league was given a shot in the arm in the national capital thanks to veteran Canadian Iain Hume’s goal-scoring skills with a timely hat-trick.
Kerala have won just once in eight meetings against two-time champions ATK, a 2-1 victory that came three years ago.
Fourth home victory on the trot lifts Coppell’s brigade to second in standings as Pune hopes suffer major blow.