He can fill the rarely used 4th striker place freed up by Elvis.
Better than not having a 4th striker.
This is the theory of anybody is better than nobody, that I don't subscribe to. O'Grady has almost none of the skills we need from a 4th striker, given he's in a similar mould to Hemed and Murray.
I think we will go with Murphy/Skalak/March as the 4th striker, and that's a better solution for me than O'Grady.