Unless Val Holmes decides he wants to be a Tiger, there are a few more unheralded guys that could fit into the backline, or at worst, offer strong competition.
I've mention Isiah Tass & he would be a great addition.
Hayze Perham would be an underrated option that can cover fullback, wing, centre & 5/8.
Tesi Niu is a pocket rocket that can cover centre & wing for flexibilty.
I'm sure I'm about to hear how terrible Niu & Perham are, but if they are good budget depth options capable of putting pressure on the likes of Staines, Doueihi & Olam for starting spots- they are good additions.
Tass would be an instant starter- but any of the 3 are good imo.