Reply To: Who is Rav Shlomo Kanievsky? Is he being groomed to be the next Godol HaDor?

I don’t know about the others, but R’ Dovid Feinstein zt”l (Rav Moshe’s father) was huge.

To play devil’s advocate, it’s much harder to find in the last few decades. But you’re right, there are definitely well known gedolim whose fathers were not.