"Caulfield might not be his track. He's had three runs there and hasn't quite 'pinged' there.
"But I knew this race was at the end of March, so I had plenty of time to get him ready, freshen him up and recalibrate.
"He had a little jump-out 12 days ago. He showed his usual speed and was very controlled in the jump-out."
Begg and his team have worked hard on Katsu getting him to settle in his races as when he was a younger horse, he wanted to get his races over and done with.
That work was evident when successful in the Kensington Stakes, before he charged along in front in the Caulfield performance.
While disappointed that Katsu did not make it to the Oakleigh Plate, Begg said the form from W J Stakes had worked out with Queman going on to win the race.
But Begg sees Saturday's contest as a winnable race.
"He's drawn a good gate on Saturday to build his momentum up," Begg said.