You need to read the SEC filing in detail as that’s a misconception.
The bulk of that $15 million was in the form of stocks Durkin can’t even vest until March 2020. And only if Activision Blizzard meets certain financial goals. He also still needs to be employed at Blizzard for him to vest them at all.
Here’s a link to that SEC filing -
https://investor.activision.com/node/32176/html
Durkin only actually got $3.2 million in cash as a sign up bonus. Since he can’t vest his stock options till March 2020 he can’t even use the rest of it for anything until then.
Durkin’s technically covering the equivalent of 4 positions as he was also appointed president of a new division where he would act as a higher level COO for 3 other divisions within Blizzard.