It can get very complicated with the scenario you have put together.
Poore, Morris, Sailor are the only NRL players off contract, while Henry and Marketo are the only confirmed players under contract. There are other names you have left out e.g. Suckley, King that are also under contract. And of course, the other NRL players off-contract Paea, Lett, Ranieri, Thorby etc
There's 19 NRL players currently under contract, unless salaries are moved around. I'd say there's a position for a winger, a centre, a half, two props and a backrower or prop depending on other signings. The rest will have to be in the NYC or 2nd also tier. It's about who you can convince to stay, which depends on whether they are eligible for the NYC next year, what kind of opportunities they see here and elsewhere ...
Best case scenario, internally, would have the six spots going to BMorris, Whare/Linnett, Henry, Poore, Merrin, Paea/Marketo.
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Whare and Linnett would come down to what was being offered elsewhere. Linnett is over age, while Whare has another year in the NYC next year, which may help. Also Travis Roche has another year and I think we need to see how he comes back from injury.
I think we need to try to keep all three, as difficult as it could be. I'm not sure there are any long-term centres in first grade ... Cooper is there for another couple of years, Scott is an in between ... as is Stanley, though he's more a backrower long-term, whereas Scott may stick. Boyd can play centre but he's our fullback for the forseeable future. Nightingale would be closest to a long-term centre.
If Fien is replacing Priddis, i.e. Priddis does retire, I'd be giving the spot to another young centre.
Paea/Marketo depends on Poore. Paea will probably get a better offer, if Poore stays. Marketo is under contract as stated. Merrin and Hancock are in a similar situation to Linnett/Whare. Hancock has another year in the NYC.
Rosser and Jones also have time. Vickery could be tricky with other teams looking at outside backs.
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In terms of talent, this would be my depth chart (Under 20s Squad) ...
Fullback: Kyle Stanley, Travis Roche, Chris Astill, Henry Raiwalui
Winger: Joe Vickery, Chris Astill, Kalifa Fai-Fai Loa
Centre: Dean Whare, Travis Roche, Kane Linnett
Halves: Beau Henry, Kyle Stanley, Scott Rosser, Josh Kent
Lock: Wes Suckley, Alex McKinnon, Nathan Jones, Brad Hudson, Sam Campbell
2nd Row: Jarrod Thompson, Alex McKinnon, Wes Suckley, Jake Marketo, Ken Edwards, Jack Stockwell, Clifford Morris, Brad Hudson, Nathan Jones, Sam Campbell
Prop: Tom Hancock, Trent Merrin, Jack Stockwell, Wes Suckley, Shannon Wakeman, Ken Edwards, Sam Campbell
Hooker: Cameron King, Mitch Rein, Brock Dunn
Utility: Cameron King, Brad Hudson, Josh Kent
Also Jarrod Broderick hasn't played yet but he'll be in amongst the best outside backs. Ahead of two of the current starters in Raiwalui and Fai-Fai Loa.