I've no real idea, but for my input - there are quite a few starting 'certs' but I think it depends on how Sam wants the team to play.
There are 3 places up for grabs I think if all fit - centre (Ratch/Wrench/Tai), starting prop (Harrison/Musgrove) and 1 bench spot (between Harrison/Musgrove).
1-7 is fairly fixed for me if all fit - except for the 2nd centre spot (King is the other one providing he shows his worth from day 1 - and in Sam's previous coaching role he has shown he has limited time for reputations).
I've head positive things said about Wrench recently by Sam, so who knows.
1 Dufty
2 Thewlis (probably takes goal kicking duties if Ratch not at 4).
3 King
4 ??
5 Ashton
6 Williams
7 Drinkwater
The forwards and bench are much more difficult to call.
8 ?? (Musgrove or Harrison)
9 Walker
10 Vaughan
11 Currie
12 Fitzgibbon
13 Nicholson
14 Powell
15 ?? Musgrove or Harrison
16 Crowther
17 Philbin
Kasiano / Bullock could get a gig here depending on injuries. I thought we had too many big props last year but we struggled with injuries/suspensions as could Dwyer. (Dudson, Green, Thomas, Whitehead could to but not necessarily in that order - and of course Hayes in the halves has impressed me from what I've seen).
I'd love to see some of the youngsters come through on merit but whether it's too early or they are at the right level I'm not sure.