I would count Wright, Edwards and Mulford as nailed on for next season.
Would love to see Riss back, but not sure he will fancy a full Championship season again.
Hume was excellent in his last visit to Redcar, and if you could get Gilkes as a second string I think he would be fine.
Intrigued by the mention of Pearson above - from memory he has done ok round Redcar in the past and certainly has potential.
In short, I have no idea.