I'd go with the following 17:
1. Mathers
2. Clare
3. Purtell
4. Welham
5. Caro
6. Gaskell
7. Addy
8. Kavanagh
9. O'Brien
10. Sidlow
11. Olbison
12. Ferguson
13. Pitts
14. Blythe
15. Lauaki
16. Haggerty
17. Mellor
I've not been overly impressed or disappointed with Thomas to make a decision. However, Fev will be a top half side despite the loss of personnel so I'd go with Mathers from a purely defensive organisation point of view.
Think Lauaki has something to prove and has looked fitter and more of a handful in the friendlies than last season so i'd go with him over Walker.
Haggerty and Kavannah both looked handfuls so I'd give them the nod too.