I guess we aren’t privy to the training environment.
SM just may not think they are quite ready above the players that have been selected in the 12. It would be a tough balance to leave players out to expose others, and look what happened with JLP left out.
To then leave out Dwyer to include Horjus would probably be quite detrimental to Dwyer. The benefit of being exposed to the team environment alone would be enormous for Ervin and Horjus.
Parmenter probably doing a bit of her own soul searching right now.