I don't really buy into the whole idea of chance creation. Players who take more shots and score more goals make it seem like the players who pass it to them are creating chances. When Jesus receives the ball, skips into the box, then touches it 20 more times and passes it backwards or loses the ball, it isn't recorded as a chance. I think it absolutely is a chance, though, in the more real sense of the word.
It seems to me that chance creation goes up when you have a forward line that is balanced between players whose instincts are to retain possession and look for that extra pass, and players who can't help but try to score at all costs. Obviously, high level of skill and physical attributes is required for both, which can still result in problems, but the balance feels off.
A separate but related issue is competition in depth. There doesn't seem to be a single signing that would solve both the balance and depth issue in our forward line, but we need to address one of them. The key to a depth signing would be that it is genuinely competitive in our squad, so it has to threaten the minutes of Martinelli, Trossard, Jesus, Nwaneri, etc. This is what Williams likely represents, rather than redressing the balance issue.