Sean Bowen good or bad ride

The 3.16 at Perth today,Sean Bowen rode the well backed fave Atlantic City. It was a fairly moderate run race with Sean on AC tucked away at the back . Three from home Bowen was a good 6 lengths + behind the winner but AC made very smooth headway to actually take the lead at the second last but it was a sprint finish and just got ran out of it .
  I know things are easy in hindsight but Sean would of known it was a slow run race so why not keep.AC a bit closer or more importantly why not make his move at the last instead of second last ..he must of known it would be a sprint finish