We do Seem to have an embarrassment of riches in the backs at the moment.
Assuming Sneyd & Kelly fit, then they play HB.
Centres - Tuimavave, Griffin, Fonua & Conner - possibly in that order ?
Wing - Naulago, Swift, Fonua, Faraimo, Dawson Jones.
FB - Shaul
Fonua will play whenever fit, so by my reckoning we have at least one back too many - even allowing for one out with injury.
Can't really imagine any of those not in the first team playing reserve grade more than occasionally - I suspect the odd one ( or two ) might be loaned out if all fit after pre-season.