Yeah, you're probably right, the first I looked at it, the people who were happy stood out the most. But row by row:

Everyone in the front row looks pissed. In the next row, one person is hidden. Probably fell off the right due to loss of bloodflow to the their legs from the thigh crush. Two people are pissed. Guy in hoodie is happy. Must have no thighs. In the next row three people are happy. Guy on wing is happy. Or he's praying to a deity because he's trying to ensure that when he enters the afterlife in the next few minutes he'll be let into heaven. Hard to see everyone behind them. They're probably passing out from the lack of bloodflow to the bottom half of their body as well.

Bottom line: Skyrush was a failed ride. Time to get another hyper.