In these tables Kapil's full career data is taken into account(which includes his career end terminal decline data too). When Kapil has played 198 inns against Imran's 151, it is only sensible to take datas for Kapil's first 151 inns(before his terminal decline started. especially so because of them being all rounders & in those days
one dayers where very few compared to these days.So these 47 inns difference is a huge gap).
Secondly winning & losing depends on the over all strength of the team.In other words 'won while chasing' etc is not entirely dependent on one player.
Yet i will sort out 1 data from this list which clearly reveals the fall in numbers of Kapil due to terminal decline(that is in his first 151 inns & once after his full 198 inns).The record is in 'won while chasing'(though it is not entirely dependent on one player either)
Kapil : 33 15 588 32.66 602 97.67 (in first 151 inns)
Kapil : 40 17 627 27.26 91 (full 198 inns)
Imran:26 13 597 45.92 62.97
Here Imran with his 13 notouts raises his avg: from 33.41(career avg

to 45.92(12.51 difference)
Kapil raises it from 25.87 to 32.66(6.79 difference)
but str: rate difference for Imran 72.65-62.97 = 9.68 fall
str: rate difference for Kapil 99.90-97.67 =2.23 fall only
If Imran raises his avg: by 12.51-6.79 = 5.72 , his str: rate falls by 9.68-2.23 = 7.45
So all in all not nothing much to separate them in 'won while chasing' too any way