The data center industry is a relatively small community. Even though the overall data center market is growing there is a consolidation of power going on. There are shifts to those who are the best at building out data center infrastructure.
Some stick to a group of people they have worked with for years like being loyal to your alma matter or home team. They take comfort in the familiar. This is where the term "old boys club" can be used to describe this behavior.
The Golden State Warriors won the NBA finals and Steve Kerr was the star along with MVP Stephen Curry. Steve Kerr was seen on his plane flight back to Oakland with two things that don't fit a SF bay area focus.
If Steve Kerr was old school he would have a SF 49ers shirt or SF Giants and a book about UC Berkeley's crew team.
Digging a bit further it appears that Steve Kerr and Pete Carrol have become friends, coaches who want to have the best team.
The ideas continue on how they shared ideas on how to be the best.