Devils Advocate here:
I don't see us having any choice but to play Smith at FB this game if Whare is injured.
If DWZ moves from Wing to FB, who plays on the Wing? From our top 25, we have Gennings (injured) and Rennings (hasn't trialed with the NRL team, and does not play Wing).
If Hiku moves from Centre to FB, we either move DWZ into Centre (and see above for consequences), or put Yeo as a stop gap.
The other alternative is to look outside our Top 25, however I think it's a bad idea to start eating into your second tier cap in Rnd 1.
Notwithstanding a man of the match performance from Smith this weekend, when Whare comes back in, Smith will be gone. The decision to play Smith says much more about our injured backline than it does about Smith's standing.
IMO Smith has played his best footy in the NRL at fullback, and finished last season extremely strong. He may have been underwhelming in the trials, but he was playing in the halves/hooker, which is not his strong suit.
For mine, Hook has made the right call in this case. Hopefully he has a blinder, and we get the win, regardless of which 17 are named.