Your understanding is shallow so let me school you.
The ONLY (mark my words - ONLY) reason Indians become CEO's of some large companies is because a majority of those companies' employees are Indians as well. The herd is happy if one of their own leads the pack. Makes for good culture and employee retention.
Management capability has ZERO to do with it. Pichai and Nadella are good order-takers from their boards and major shareholders.
That is the quality board members in major companies are looking for. Quiet order-takers.
There are no people like Jack Welch or Steve Jobs Made in India today.
Maybe someday - but not today. Rote memorization education and exam cheating culture do not produce those types of innovative people.
And there ARE Pakistanis who are CEOs of larger companies. Even Bangladeshis to some extent, but numbers will be smaller.
But Bangladeshis and Pakistanis don't leave their country in the numbers as Indians do.
Heck Indians even go to work in Bangladesh illegally. Lakhs of them. This is fact. So there will be CEO's among them, this is a numbers game.