I am all for change and agree Lawton and Tomane must come in.
Taga would be pretty close not sure who to get rid of for him though - he lacks the work rate for prop he really needed to develop his game further over the past 12 months and he hasn't - that is on the coaches IMO.
As for Walker, I don't think he has ever looked a first grader, but can see the argument for giving him a few games to test - HOWEVER no NRL could ever have both him and Preston in the 17, let alone one with Mead and (the 2010-11 model) Prince already there.