I think it's likely that Williams has had a moan and Curle has benched him as punishment.
Let's hope that Williams moaning is seen as constructive and about desire and similarly that Curlio feels he's "learned his lesson" and plays him from the start.
Given the main role as Lead stiker / target man / whatever, I think Williams could be a 1 in 2 man
Williams is a good all rounder but he's 33 in August.
You could say that Curle benching him has worked, look it his reaction. Buy anyway he's nearly 33, his impact is time limited and can understand Curle looking elsewhere, particularly if he's looking to bring the age of the squad down.