It depends on the companies. Some companies have something quite structured. Some companies say, “You as a senior leader need to be mentoring three to five people; that's part of your performance evaluation. I'm going to find out from those people how you're mentoring them.” There are different models, but companies are doing that well.
The sponsorship thing is different, and I like what Tom Falk did, because he said that sponsorship is succession planning and getting people into senior roles, and if you're only sponsoring people who look exactly like you, there's no way we're leveraging our talent.