This may be Ganguly's first official match in India, but last year he had played for Northamptonshire in county and was reasonably successful in 20-20. In county, he batted moderately well, but bowled better. In fact, his bowling record in county was better than Zaheer's.
Yesterday, his 26 in 20 balls (that leads to about 160, a possibel winning score) was not bad, at least for an opener who is usually a bit circumspect to start with in 20-20. Besides, he got 2 wickets for 16. So, it was not a bad show. But everything said and done, he may not continue in 20-20 that is pre-dominantly more a power game.