Young BW vs. Young HW

Young Generation - I am defining as those who are in their 20's now and have established themselves.

Bollywood: Only one face emerges:

Young HW:

How come BW has not produced actors like Saoirse Ronan and Timothy Chalamat?

There could be two reasons for this.

Alia was the only one who survived from her generation because all the competition against her was removed by Karan Johar.

OR

The previous generation of Deepika, Kareena and Katrina didn't allow the next generation to take over from them. Just like Khans didn't allow the generation of Ranbir and Ranveer to take over from them, and Alia was the only one who had solid backing and connections to survive.