The SFI's doing day one is like the RST & LPC checks, SFI day 1 then LTC for the LPC on day 2
The classroom stuff they teach on day 1 of ground school is above the level they were trained as an F/O and so its not an F/O teaching someone to be a captain, its an SFI going through some fundamental stuff and facts, cant see a problem with that at all, the SFI's are much more knowledgeable than I am as an F/O flying the line, and this is down to the extra training and been constantly in a training environment.
I never look at the SFI's in an RST thinking who the hell are you trying to teach me when were in the same job on the line, and nor do any of the captains I have done recurrent training with, they are well respected in the airline and for good reason I feel.
End of rant