That is rare because often Sires' Stakes heats are dominated by the same horses and the double ups means fourth or even fifth has been good enough to guarantee you a spot in the rich final in the past.
That could be the case at both Addington and Alexandra Park tonight and therefore create some flexibility to get Bad To The Bone into the race but Purdon would rather take the guesswork out of play. "Having different horses all getting points so far hasn't helped us so I'd love him to run top three this week to seal his spot," says Purdon.
"He is good enough and well enough but the draw makes it tricky."
Bad To The Bone has drawn one on the second line in a race either favourite Line Up, or his stablemate Copy That, would be expected to lead.
So if Butcher chooses to stick to the markers he gets the luxury of the short way home but will need a strong tempo and luck with gaps to run top three.
A less risky option could be sliding straight away from the inside, which he can do as the only horse drawn on the second line, to try and punch through behind Line Up at the start and get handy in the running line.
From there he might even threaten the favourites but a lot will depend on whether both Line Up (likely early leader) and Copy That (drawn wide) settle in front of him, with that Ray Green-trained pair extremely hard to beat if they end up lead and trail.
Purdon is confident Mach Shard (race eight) is at his peak for tonight and on the right path for the New Zealand Cup.
"He has gone two good races behind Triple Eight lately and his standing start manners have been good," says Purdon.
"I think he might be even better this week and he has to be hard to beat."
Purdon is also expecting a more prominent run from Wainui Creek (race seven) after she was luckless on her debut for the stable last start.
"She was a real victim of circumstances but she had a better draw this week and the chance to be handier."
Purdon realises Sunny Glenis (race one) faces a decent step up in grade tonight while Flying Finn (race two) faces a potentially tricky barrier draw in one of tonight's mile races.
Major Jellis (race four) was impressive winning on debut but jumps up a long way in grade while Purdon favours Bettor Listen over Be My Rock of his two in race five but predominantly because of the draw.