At this point none of the guys available are going to be difference makers. This guy, Robinson, OBJ, Chark, who cares. None of them would have a big impact.
Beane decided when he chose not to take a second WR that we are rolling with Coleman, Shakir, Samuel and Hollins.
Hamler is a small wildcard, there is some potential there if he can stay healthy.
Of course they could make a trade, but if you believe Beane, there is zero chance of that happening.