Dunn doesn't know why.
"He is racing super but we haven't changed anything," says Dunn.
"He just seems sharper and is sprinting really well and that's why we've been taking a trail with him, it's been bringing out his best."
Dunn says that will almost certainly be the case tomorrow and that could shape the race as Classie Brigade is a fast beginner from the stand but has the respect to get the lead off any of the outsiders and then hand to who Dunn would like to follow.
"That is what I'd like to do, take a trail on the first or best one of the other three," he says.
That "other three" are Copy That, Self Assured and South Coast Arden so Dunn is suggesting, as much as anybody can know how chips will fall in a standing start, that the lead may be there for the best behaved of the favourites.
That is encouraging for Copy That, the Auckland speedster who has drawn wide on the front line, while the other pair are drawn on the second line, suggesting traffic could be more of a concern for them.
Securing the lead by no means guarantees victory but it is the shortest way to the winner's circle after any major harness race, and Copy That's best career performances have been when he has led.
Copy That has been the best backed in early betting, albeit not the hard money bookies fear most, but is in from $4.50 to $3.80.