McKenna played forward in the scratch match by the look of the highlights video. I’d personally be delighted to see him given a few games as a mid-sized forward (perhaps at the expense of Cahill - who isn’t ready - to improve the aerial strength of the forwardline).
Langford comes in at the expense of Ham, who while promising is simply not strong/fast/fit enough for the highest level yet.
Obviously Bellchambers goes out for McKernan if ready.
Townsend is lucky that others have been worse than him.
For those who want Mossie, patience, he is still far from ready.