Former New Zealand rider Dee wouldn't comment about the quick loss of his short term engagement but can apply to the stewards for a riding percentage of anything Amelie's Star earns on Saturday if the stewards deem his booking was confirmed before the Williams change.
Riders having better luck are apprentices Beau Mertens and Ben Allen back up on rides they took on Caulfield Guineas Day.
Allen won the Herbert Power Stakes on Lord Fandango (drawn 9), while Mertens will partner Mick Kent's mare Abbey Marie (5) for a third time this Saturday, all of those runs at group one level, after finishing eighth on her in the Caulfield Stakes.
He has only been race riding for about two-and-a-half years, but it will be Allen's second ride in a Caulfield Cup -- having partnered Pemberley, also for syndicators OTI Racing, in last year's race.
Craig Newitt has been booked to ride Hardham (8) for the first time since being aboard him twice in last spring's Danehill Stakes and Caulfield Guineas Prelude while Cory Parish was the final rider confirmed, to partner the Lindsay Park-trained Boom Time (3) in what will be his first ride in the race.
Meanwhile, it's all systems go for Johannes Vermeer ahead of the Cup according to the man looking after the Aidan O'Brien-trained runner.
T.J. Comerford, O'Brien's travelling foreman, said Johannes Vermeer has bounced out of his performance in the Caulfield Stakes and is confident of another strong showing this weekend.
"He ran very well, we thought as much. He was absolutely flying since he got here," Comerford said.
Johannes Vermeer has firmed enormously in betting for the Cup after drawing barrier two and is now the $5 outright favourite.
The Darren Weir-trained Humidor is at $6 and will jump from barrier seven while Bonneval is at $6.50.
BMW Caulfield Cup field and barrier draw
1. Humidor (7) 56kg -- D Weir D Lane
2. Marmelo (10) 55kg -- H Morrison H Bowman
3. Johannes Vermeer (2) 54.5kg -- A O'Brien B Melham
4. Jon Snow (6) 54.5kg -- M Baker & A Forsman S Baster
5. He's Our Rokkii (15) 54kg -- D & B Hayes & T Dabernig L Nolen
6. Sir Isaac Newton (17) 54kg -- R Hickmott K Mallyon
7. Ventura Storm (4) 54kg -- D & B Hayes & T Dabernig D Oliver
8. Wicklow Brave (16) 54kg -- W Mullins J Moreira
9. Inference (11) 53.5kg -- M, W & J Hawkes D Dunn
10. Single Gaze (12) 53kg -- N Olive K O'Hara
11. Bonneval (14) 52.5kg -- M Baker & A Forsman K McEvoy
12. Hardham (8) 52.5kg -- D Brideoake C Newitt
13. Boom Time (3) 52kg -- D & B Hayes & T Dabernig Cory Parish
14. Abbey Marie (5) 51.5kg -- M Kent B Mertens (a)
15. Harlem (1) 51.5kg -- D & B Hayes & T Dabernig C Schofield
16. Amelie's Star (13) 51kg -- D Weir Craig Williams
17. Lord Fandango (9) 50kg A Alexander -- B Allen (a)