Players not finishing their rounds the first two days at Scottsdale happens every year, without fail.
An hour frost delay is EXTREMELY common, which is automatic darkness suspension at the end of the day with the last groups only completing 2/3 of their rounds.
However, they got lucky and didn't have one today.
Limited daylight is the biggest factor. This is the first event of the year in the mainland without a companion course. 132 players. Groups tee off every 9 minutes, which is the shortest gap of the year for threesomes, I believe. After the reworking of the course, it isn't a walk in a park the desert anymore. Add the 100,000+ crowd watching on a Thursday...
Let's just say, I'm not surprised.