Quote Bilko="Bilko"As per Official Website....
Joe Mellor, Josh Charnley, Darrell Goulding, Anthony Gelling, Pat Richards, Brett Finch,Sam Powell, Jeff Lima, Logan Tomkins, Ben Flower, Harrison Hansen, Liam Farrell, Chris Tuson.
Bench: Eric Lauaki, Lee Mossop, Michael McIlorum, Tom Spencer, Jack Hughes, Matthew Russell, Gil Dudson.'"
Seeing that the bench only contains one back (Matty Russell),maybe Wayne is thinking along the following lines.
It gives him a chance to see how Mellor goes at fullback and to take a look at Finch and Powell in the halves
Then if things are going well at halftime it would give him the chance to have a look at Russell at fullback with Mellor at standoff so he could have a look at how he would go with Powell in the halves and give Finch a rest (he knows enough about Finch if things are going well).