One problem is that if Collis is back (and properly fit) he is a certainty for the centre. Even before Walshaw?
I'm thinking Mathers was actually taking Collis's place and Walshaw was on other side.
So then the question is, to keep Walshaw and also play Collis, you have to drop Mathers or Siejka, and Lyne, Fox or Riley
It's a tough call on the wing. Each has his own problems. I like Lyne but he keeps making mistakes that seem like easy ones he shouldn't make. Fox is good when good but has not hit full stride this year and Riley is good enough without being flash. He takes the high ball, so I'm inclined to say he stays just to plug that normally glaring flaw for us.
Assuming Lyne can play on the other wing I'd go for this:
1) Sammut
2) Lyne (but maybe Fox!)
3) Collis
4) Walshaw
5) Riley
6) Sykes
7) Godinet
Siejka can spell at hooker when McShane runs out of puff.
I know I picked Sammut over Mathers, and Sykes at full back but for all I have been calling for him to be closer to the action, his position at full back is growing on me.
He has much more urgency that Mathers has, and is a great attacking strike player from there.
As long as Sykes can keep his levels up at stand off I think Mathers is the utility player for a while. Mathers clearly has great organisation skills but we are gradually getting that back so am thinking we stick this way from now on and give it a chance.
If Collis not fit then Mathers is back in.