I cannot give great detail about internal VAC people & processes, but I know that lack of a CF98 or 663 will not be a show stopper in this case (for Res F Pte Bloggins who breaks a toe on a weekend Ex, it does complicate it). It is what is on a medical record (military and/or civilian) that can be the deciding factor. These troops are being tracked closely.
Here, we have received the bulk CASREP giving name/rank/SN for all of those killed and injured. Actions have been initiated, Designated Assistants are going out to all impacted families, briefings for the MND/CDS etc on benefits and services available to Reg F & Res F casualties are being prepped/delivered. At least in this case, as it is so high profile, they will not be overlooked.