I believe Bradley, Dornbush and Miner WERE asked and they declined 4CC. Bradley and Miner have both recently recovered from pretty serious injuries. Dornbush has had an extremely busy season (two JGP events and the JGPF) and another competition before Worlds might be one too many.
One concern: ISU World Rankings. Bradley is #27, Dornbush #42 and Miner #48. These rankings may get lower after 4CC points are added for the men who participate. SP start order is based on ISU World Rankings. The earlier Dornbush and Miner start in the SP, the lower their PCS scores may be.