It is hard and unfair to compare sportsmen across generations. Prasanna's average may be worse than Warne/Murali since ground fielding and catching was poor compared to today. At the same time, batters today have better gear and are more aggressice than before... you dont see people just hanging around and blocking all day anymore. Also more cricket is played now.
I think a truly all-time great bowler is one who dominates his generation of batters. Warne and Murali have done that. I believe Prasanna perhaps also did that in his time.
