Maybe we don't know everything. I also read that Williams wanted a guarantee of a place in the team, but Flick did not want to agree to that, and I can understand him. The issue was that Williams plays in the same position as Raphinha, and he is worried he might be left without playing time. Though to me it seems unlikely, because there is no point in buying a player like that just to leave him on the bench. But if for the second season in a row they cannot reach an agreement with him, then they should forget about him. There are other players available.