Last night, Locadia was largely isolated - even Murray can't function that well at all without Gross, or any other support.
In short, there seems to be an element of 'Locadia didn't score, therefore he's not as good as Murray'. If you're going to compare them on one game, and on merely one...
Button's handling and command of the area was fine, though his kicking (when he connects) needs some work. Worried that he seemed to be a bit rattled by the Southampton fans.
Barclay played - for the most part - fairly well. Got done for the goal, but certainly put in a shift.
Collar also...
Many of us learned many things last night about various players. Not sure why you've zeroed in on Locadia when you are, in effect, comparing apples with oranges.