i've played a game where Cork became one of England's best players.. but in that game Israel were the best team in the world and England were mediocre..
he did very well on my last save, was the new Danielle De Rossi at Roma for seasons and a couple of games for England, good player (he actually got better than Rodwell stats wise) i had a screenshot of him, wait let me find it.... (here we go)
I think with both, certainly Wilshere, they have to play early on - otherwise their PA seems to drop (unsurprisingly) but once he's good - i think he's pretty darn good! Not too sure about Cork though - best ask Raikan...