I would have said they bought the horse after Kaikoura and were running tests on it before then. So at least 2 weeks training and other information longer.
99% of the time as I've shown with Swayzee the improvements aren't all that significant. Arguably you can say the same for Cya Art.
With no evidence for performances that based on the horses previous form is attainable. Do you really think that given all the publicity, innuendo, inference and accusations of wrong doing that Cya Art and Swayzee weren't being closely monitored by the RIB over the last two weeks? Pre-race blood testing was done and both horses were swabbed.