I think it's a MASSIVE (hope that emphasises it enough) season for Field, Edwards, Burke, Leko, Fitzwater and Max Melbourne. If they don't properly break through this season I don't think they will be here the following season.
O'Shea is only just 20, that's very young for a centre back so I'd give him a years grace despite him doing really well at Exeter.
The likes of Tulloch, Wilson, Rogers are still in their teens so still early for them. Louie Barry is barely sixteen so he's a baby.