Cal was 2nd on the grid but some other riders got the jump on him to the first corner. He was running around in 4th for most of the race but got overtaken by Rossi with around 5 laps to go. He was a bit wide when Rossi overtook and couldn't stop it in time for bend number 1 so ran off track and lost a little bit of time. If he hadn't run off the track he arguably could have kept with Pederosa and maybe pipped him on the line but realistically 4th would be about the best he could have hoped for.
Cal does seem to struggle to overtake some riders from time to time. He can string a very quick lap together but getting past somebody on the ragged edge at around his own pace seems to hinder him a little