The reason I picked Kapil in my team is that there are 2 non Asian countries where he is arguably the best asian bowler ever, and unarguably among top two. This is of course before Bumrah arrived, and I will wait a while longer before rating him.
When an asian team travels overseas, at least 3 gun bowlers are required in every country. Best on their historical performance, these are the best bowlers in individual countries.
Australia - Kapil, Wasim, Imran
West Indies - Imran, Kapil, Waqar
England - Imran, Wasim, Waqar
NZ - Imran, Wasim, Waqar
Sub Continent - no need to discuss
SA - an issue because of low sample size, however I would still bank a couple of them to show up well.
So, it is not about picking the 3 best bowlers, but covering all bases by picking a 4th quick. Also, Waqar's record is a bit suspect in a couple of countries unlike Imran and Wasim.
Also, Kapil had the unique ability to turn around a match in a session, with the bat. He is the only one in the bottom 5 in that team who could that. Imran needed time to score big runs and is a solid bat, not just a counter attacking one. Akram could play odd blistering knock, though nowhere as good as Kapil in that aspect.