Okay my fault I didn't back up my earlier argument with statistics. So here they are :
Kumble had the services of the capable Nayan Mongia from 1994 to 2000. During which time, his stats were as follows:
Code:
Mat Inns Overs Mdns Runs Wkts BBI BBM Ave Econ SR 5 10
42 72 2079.4 496 5232 185 10/74 14/149 [B]28.28[/B] 2.51 67.4 10 2
So for the remaining period, his stats are as follows:
Code:
Mat Inns Overs Mdns Runs Wkts BBI BBM Ave Econ SR 5 10
88 159 4620.1 1063 12803 431 8/141 13/181 [B]29.70 [/B]2.77 64.3 25 6
Clearly an average differential of about
1.42. Also note that the period when Mongia was in operation was before 2000, i.e, when Kumble was peaking into being India's premier bowler. So, obviously, it can be extrapolated that a Mongia-esque keeper would have ensured an even better average, and the presence of a Solkaresque infielder would have even done better.