The replacement was always going to be someone much weaker than Z/E since they were a seeded team, but I don't think USFS tried to pick an obviously weak team in comparison to who else was available.
Here's the list of who was available from
@Sylvia's earlier list.
PAIRS (next 10 on last season's ISU SB list):
PRK RYOM & KIM (CoC; did they decline IdF?) ISU SB 16--when Jones/Boyadji were chosen, it looked like Ryom/Kim were being selected for IDF so they likely were not available
AUS ALEXANDROVSKAYA & WINDSOR (SA) ISU SB 26 already there
CAN RUEST & WOLFE (SA) ISU SB 29 already there
USA LOCKLEY & PROCHNOW (none) ISU SB 33 American, couldn't be selected because already 3 USA teams
USA LU & MITROFANOV (RC) ISU SB 35 American, not able to be selected
RUS KUDRIAVTSEVA & SPIRIDONOV (none) ISU SB 36 available
CRO PETRANOVIC & SOUZA-KORDEIRU (none) ISU SB 37 available
GBR JONES & BOYADJI (none; are they competing this season?) ISU SB 38 chosen
USA DIGERNESS & NEUDECKER (none) ISU SB 39 American, not able to be selected
USA PFUND & SANTILLAN (none) ISU SB 47, American not able to be selected
Would you feel better if Kudriavtseva/Spiridonov or Petranovic/Souza-Kordeiru were chosen?