You chose Choice One. Blalock should do the surgery alone and discuss with Thomas afterward.
Blalock developed the procedure with Thomas. Even without hands-on practice, he should be able to get through the surgery.
As the chief surgeon of Johns Hopkins, Blalock would set a poor example by allowing a lab technician without "formal training" to aid him in the surgery.
Requesting Thomas's presence in the operating room would raise questions about Blalock's own ability to perform his surgical duties.
The life of a baby hangs in the balance, and Dr. Blalock will need all the assistance he can get to make this groundbreaking procedure successful.
Blalock needs Thomas' and the administration's trust and confidence to continue their experiments, which he could lose if the baby doesn't make it through the operation.