I sorta agree with you, but sorta don't. While I don't think you can squarely lay the blame on any one person, culture comes from the top. The board/CEO (but mostly the CEO) sets the culture, and hires (or molds) other executives and leadership positions into their vision of that culture.

Page and Brin chose Pichai to succeed them. They, and the rest of their board, share blame as well.