Goldman's Carey: "if you take a look at the revenue projections of new stadiums or renovated stadiums, you don't miss by much" (except Barclays?)

A 4/1/19 Associated Press article, Tottenham Stadium follows US financing model, explains that the Tottenham Hotspur Stadium in north London will gain revenue not just from tickets but also from American-type sources, including "hospitality, broadcast, sponsorship, merchandising, concessions, advertising and digital rights."

The article quotes Goldman Sachs' Gregory Carey, a managing director, who's worked on Yankee Stadium, Barclays Center, MetLife Stadium in New Jersey, and much more:

Carey views the structure as similar to financing a road or a port.

"There's three risks you have: construction risk, completion risk and revenue risk," he said. "What we help the clubs do is eliminate those first two, how we can make sure we're going to get this thing built on time and at cost, and then we invest, we give them money or we get investors for that revenue risk. And if you take a look at the revenue projections of new stadiums or renovated stadiums, you don't miss by much."

OK, so Barclays Center surmounted two of those risks: construction risk and completion risk.

But, actually, it missed revenue projections--or, at least, profit projections--by a long shot. Which leads to the lingering question: what went wrong that led to revenue risk?