McGinley is never a full back, he’s the best fit for filling in at the moment.
The first has been explained further up, both he and Gallagher move one across to cover the gaping hole left by Mugabi... again. Damned if they do, damned if they don’t and the ball is dropped centrally.
Whilst caught in possession for our 3rd, regardless if the game is gone at that point, Mark O’Hara can’t escape criticism for another non attempt at protecting the back four - the primary role of holding midfielders.