He played DE, didn't really make any standout plays. With Flower playing as well as he did, though, I'm not sure it really matters. He's either fifth or sixth on the DE depth chart right now, depending on whether Zach Moore is listed as DE or DT.
I don't think Grissom was drafted to contribute this year. More of a forward-looking pick to account for the fact that Ninkovich is 31 and Jones is probably gone after 2016.